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Cabaletta Bio, Inc.

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FY2019 Annual Report · Cabaletta Bio, Inc.
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

(Mark One)
☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2019
OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE

TRANSITION PERIOD FROM                      TO                     

Commission File Number 001-39103

CABALETTA BIO, INC.

(Exact name of Registrant as specified in its Charter)

Delaware
(State or other jurisdiction of
incorporation or organization)
2929 Arch Street, Suite 600
Philadelphia, PA
(Address of principal executive offices)

82-1685768
(I.R.S. Employer
Identification No.)

19104
(Zip Code)

Registrant’s telephone number, including area code: (267) 759-3100

Securities registered pursuant to Section 12(b) of the Act:

Title of each class
Common Stock, par value $0.00001 per share

Trading
Symbol(s)
CABA

Name of each exchange on which registered
The Nasdaq Global Select Market

Securities registered pursuant to Section 12(g) of the Act: None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐ No ☒

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.  Yes ☐ No ☒
Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for
such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes ☒ No ☐
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter)
during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes ☒ No ☐
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the
definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer

.

Non-accelerated filer

  ☐

  ☒

   Accelerated filer

   Smaller reporting company

  Emerging growth company

  ☐

  ☒

  ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting
standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  Yes ☐ No ☒
The registrant’s common stock began trading on The Nasdaq Global Select Market on October 25, 2019. As of March 20, 2020, the aggregate market value of the registrant’s voting and non-
voting common stock held by non-affiliates (without admitting that any person whose shares are not included in such calculation is an affiliate) computed by reference to the price at which the
common stock was last sold on March 20, 2020 was approximately $144.0 million. The registrant has provided this information as of March 20, 2020 because the registrant was not a public
company as of the last business day of its most recently completed second fiscal quarter and therefore cannot calculate the aggregate market value of its voting and non-voting equity held by non-
affiliates as of such date.
The number of shares of registrant’s Common Stock outstanding as of March 20, 2020 was 24,034,022.

DOCUMENTS INCORPORATED BY REFERENCE
Part III of this Annual Report on Form 10-K incorporates by reference certain information from the registrant’s definitive Proxy Statement for its 2020 annual meeting of shareholders, which the
registrant intends to file pursuant to Regulation 14A with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year end of December 31, 2019. Except with
respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
PART I
Item 1.
Item 1A.
Item 1B.
Item 2.
Item 3.
Item 4.

PART II
Item 5.
Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.

PART III
Item 10.
Item 11.
Item 12.
Item 13.
Item 14.

PART IV
Item 15.
Item 16

Table of Contents

Business
Risk Factors
Unresolved Staff Comments
Properties
Legal Proceedings
Mine Safety Disclosures

Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Selected Financial Data
Management’s Discussion and Analysis of Financial Condition and Results of Operations
Quantitative and Qualitative Disclosures About Market Risk
Financial Statements and Supplementary Data
Changes in and Disagreements With Accountants on Accounting and Financial Disclosure
Controls and Procedures
Other Information

Directors, Executive Officers and Corporate Governance
Executive Compensation
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Certain Relationships and Related Transactions, and Director Independence
Principal Accounting Fees and Services

Exhibits, Financial Statement Schedules
Form 10-K Summary
Signatures

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K, including the sections entitled “Risk Factors” and “Management’s Discussion and Analysis of Financial
Condition and Results of Operations,” contains express or implied forward-looking statements that are based on our management’s belief and assumptions
and on information currently available to our management. Although we believe that the expectations reflected in these forward-looking statements are
reasonable, these statements relate to future events or our future operational or financial performance, and involve known and unknown risks, uncertainties
and  other  factors  that  may  cause  our  actual  results,  performance  or  achievements  to  be  materially  different  from  any  future  results,  performance  or
achievements expressed or implied by these forward-looking statements. Forward-looking statements in this Annual Report on Form 10-K include, but are
not limited to, statements about:

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the success, cost and timing and conduct of our clinical trial program, initially our planned Phase 1 clinical trial of DSG3-CAART, or the
DesCAARTesTM Trial, and our other product candidates, including statements regarding the timing of initiation and completion of the
clinical trials and the period during which the results of the clinical trials will become available;
the  timing  of  and  our  ability  to  obtain  and  maintain  regulatory  approval  of  our  product  candidates,  including  DSG3-CAART,  MuSK-
CAART, FVIII-CAART and DSG3/1-CAART, in any of the indications for which we plan to develop them, and any related restrictions,
limitations, and/or warnings in the label of an approved product candidate;
the  impact  of  any  business  interruptions  to  our  operations  or  to  those  of  our  clinical  sites,  manufacturers,  suppliers,  or  other  vendors
resulting from the coronavirus disease (COVID-19) outbreak or similar public health crisis;
our  expected  use  of  proceeds  from  the  initial  public  offering  and  the  period  over  which  such  proceeds,  together  with  cash,  will  be
sufficient to meet our operating needs;
our plans to pursue research and development of other product candidates;
our plan to infuse our DSG3-CAART product candidate without lymphodepletion or other preconditioning agents initially in our planned
DesCAARTesTM Trial;
the potential advantages of our proprietary Cabaletta Approach for selective B cell Ablation platform, called our CABA platform, and our
product candidates;
the extent to which our scientific approach and CABA platform may potentially address a broad range of diseases;
the potential benefits and success of our arrangements with the Trustees of the University of Pennsylvania, or Penn, and the Children’s
Hospital of Philadelphia, or CHOP, and our scientific co-founders, Drs. Milone and Payne;
our ability to successfully commercialize our product candidates, including DSG3-CAART and our other product candidates;
the potential receipt of revenue from future sales of DSG3-CAART and our other product candidates;
the rate and degree of market acceptance and clinical utility of DSG3-CAART and our other product candidates;
our estimates regarding the potential market opportunity for DSG3-CAART and our other product candidates, and our ability to serve
those markets;
our sales, marketing and distribution capabilities and strategy, whether alone or with potential future collaborators;
our ability to establish and maintain arrangements or a facility for manufacture of DSG3-CAART and our other product candidates;
our ability to obtain funding for our operations, including funding necessary to initiate and complete our planned DesCAARTesTM Trial
and our ongoing preclinical studies of MuSK-CAART, DSG3/1-CAART and FVIII-CAART;
the potential achievement of milestones and receipt of payments under our collaborations;
our ability to enter into additional collaborations with existing collaborators or other third parties;
our expectations regarding our ability to obtain and maintain intellectual property protection for our product candidates and our ability to
operate our business without infringing on the intellectual property rights of others;
the success of competing therapies that are or become available, and our competitive position;
the accuracy of our estimates regarding expenses, future revenues, capital requirements and needs for additional financing;
the impact of government laws and regulations in the United States and foreign countries; and
our ability to attract and retain key scientific or management personnel.

These factors should not be construed as exhaustive and should be read in conjunction with the other cautionary statements that are included in

this Annual Report on Form 10-K. The forward-looking statements

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contained in this Annual Report on Form 10-K are made as of the date of this Annual Report on Form 10-K, and we undertake no obligations to publicly
update or review any forward-looking statement, whether as a result of new information, future developments or otherwise.

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Item 1. Business.

Overview

PART I

We are a clinical-stage biotechnology company focused on the discovery and development of engineered T cell therapies for patients with B cell-
mediated autoimmune diseases. Our proprietary technology utilizes Chimeric AutoAntibody Receptor, or CAAR, T cells that are designed to selectively
bind  and  eliminate  only  specific  B  cells  that  produce  disease-causing  autoantibodies,  or  pathogenic  B  cells,  while  sparing  normal  B  cells.  Our  lead
CAAR T cell product candidate was designed based on the Chimeric Antigen Receptor, or CAR, T cell technology that has been successfully developed
and is marketed for the treatment of B cell cancers. We believe our technology, in combination with our proprietary Cabaletta Approach for selective B cell
Ablation  platform,  called  our  CABA  platform,  has  applicability  across  over  two  dozen  B  cell-mediated  autoimmune  diseases  that  we  have  identified,
reviewed and prioritized. In order to accelerate product development for our lead program and to access a proven cell therapy manufacturing platform, we
have entered into a collaboration with the University of Pennsylvania, or Penn. We hold multiple agreements with Penn to develop CAAR T cell therapies
for the treatment of these diseases. Our goal is to leverage our team’s expertise in autoimmunity and engineered T cell therapy and our collaboration with
Penn  to  rapidly  discover  and  develop  our  portfolio  of  CAAR  T  product  candidates.  Our  initial  focus  is  on  pemphigus  vulgaris,  or  PV,  which  is  an
autoimmune blistering skin disease. We submitted an Investigational New Drug application, or IND, for our lead product candidate, DSG3-CAART, to the
U.S.  Food  and  Drug  Administration,  or  the  FDA,  in  August  2019.  Our  IND  was  cleared  in  September  2019,  and  DSG3-CAART  received  orphan  drug
designation from the FDA for the treatment of PV in January 2020. We are advancing DSG3-CAART into a Phase 1 trial for the treatment of mucosal PV,
or mPV, in 2020. We are also advancing additional product candidates currently in discovery-stage or preclinical development for the treatment of muscle-
specific kinase myasthenia gravis, or MuSK MG, mucocutaneous PV, or mcPV, and Hemophilia A with Factor VIII, or FVIII, alloantibodies.

B  cell-mediated  autoimmune  diseases  occur  when  certain  populations  of  B  cells  mistakenly  produce  autoantibodies,  which  are  directed  against
specific healthy tissue or cells in the body. The presence of autoantibodies can manifest in a variety of autoimmune diseases and result in the destruction of
healthy tissue in the body. Current treatment options for B cell-mediated autoimmune diseases are generally limited to corticosteroids and other generalized
immunosuppressants that offer only temporary disease suppression, may require chronic, in-hospital administration and are associated with potentially life-
threatening side effects. We believe the ideal therapy for B cell-mediated autoimmune diseases would selectively and completely eliminate the pathogenic
B cells while sparing the body’s normal B cells.

We  are  pioneering  the  development  of  a  new  class  of  engineered  T  cell  therapies  that  express  CAARs  to  selectively  engage  and  eliminate
pathogenic  B  cells.  Our  CAARs  build  upon  the  scientific  foundation  of  CARs,  differing  primarily  in  the  use  of  the  antigen  rather  than  an  antibody
fragment,  which  enables  the  CAAR  T  cells  to  serve  as  a  “decoy”  for  specific  autoantibodies  expressed  on  the  surface  of  B  cells.  This  allows  these
pathogenic B cells to engage with the CAAR T cells instead of benign antigens, resulting in their elimination. By harnessing the power of targeted cell
therapy,  we  believe  our  CABA  platform,  as  developed  by  our  team,  has  the  potential  to  be  a  one-time  curative  therapy  that  may  be  a  safer  and  more
effective  option  than  current  treatments.  We  have  developed  our  CABA  platform  to  inform  product  candidate  development  from  scientific,  clinical  and
commercial assessment through CAAR design. Using our CABA platform, we have identified and thoroughly evaluated over two dozen B cell-mediated
autoimmune diseases that we believe will be amenable to treatment with the Cabaletta approach and have advanced several of our highest priority targets
into discovery and preclinical testing.

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Our current product candidate pipeline is illustrated below.

*
**

In our discovery stage, we perform epitope mapping and optimize CAAR construct and design.
May not be required if Phase 2 is a registrational clinical trial.

Our initial therapeutic focus is on PV, a chronic, autoimmune blistering skin disease that affects over 17,000 patients across the United States and
over 25,000 patients across the European Union. The affected PV population in Asia is recognized to be significantly higher than in each of the United
States  and  the  European  Union.  Despite  a  current  standard  of  care  that  includes  corticosteroids  and  adjunctive  immunosuppressive  agents,  PV  remains
associated with frequent recurrences as well as substantial morbidity and mortality. Our lead product candidate, DSG3-CAART, is being evaluated for the
treatment  of  mPV,  a  subtype  of  PV  that  affects  mucosal  surfaces.  mPV  is  caused  by  autoantibodies  against  the  cell  adhesion  protein  desmoglein  3,  or
DSG3.  DSG3-CAART  is  designed  to  selectively  target  B  cells  expressing  autoantibodies  specific  for  DSG3,  which  may  prevent  these  B  cells  from
producing DSG3 antibodies that are the cause of mPV while preserving general B cell immune function. The FDA accepted our IND for DSG3-CAART in
September 2019 and granted orphan drug designation to DSG3-CAART for the treatment of PV in January 2020. Our next PV-directed product candidate,
DSG3/1-CAART, is being designed to target B cells expressing autoantibodies against DSG3 and desmoglein 1, or DSG1. It is being developed for the
treatment of mucocutaneous PV, or mcPV, another subtype of PV that affects both mucosal and skin surfaces and is caused by autoantibodies against DSG3
and DSG1, respectively.

Our  second  product  candidate,  MuSK-CAART,  is  designed  to  treat  a  subset  of  patients  with  myasthenia  gravis,  or  MG.  MG  is  an  autoimmune
disease  induced  by  autoantibodies  targeting  the  neuromuscular  junction,  or  NMJ,  which  can  lead  to  life-threatening  muscle  weakness.  Our  product
candidate  targets  B  cells  expressing  autoantibodies  against  a  transmembrane  protein,  muscle-specific  kinase,  or  MuSK,  and  is  being  developed  for  the
treatment of MuSK MG.

We are also pursuing development of an additional product candidate, FVIII-CAART, which is being designed to treat a subset of patients with
Hemophilia A, an X-linked bleeding disorder caused by mutations in the FVIII gene. While our CABA platform is primarily focused on the treatment of B
cell-mediated  autoimmune  diseases,  we  believe  our  approach  may  be  applicable  in  other  instances  where  B  cell  antibody  production  is  implicated  in
response to exogenous FVIII, which is administered for the treatment of Hemophilia A. Specifically, we have identified an unmet need in cases where the
immune  system  produces  antibodies  against  exogenous  antigens,  which  is  known  as  an  alloimmune  response.  Some  patients  receiving  repeated
administrations  of  exogenous  FVIII  will  develop  alloantibodies  against  the  treatment,  also  known  as  inhibitors,  neutralizing  its  therapeutic  potential.
Patients with FVIII alloantibodies may often require high-dose FVIII, immune tolerance induction with FVIII, agents that mimic FVIII or plasmapheresis
to remove the FVIII alloantibodies. FVIII-CAART

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leverages  a  CAAR  designed  to  target  B  cells  expressing  alloantibodies  against  FVIII,  and  it  is  initially  being  developed  as  an  adjunctive  therapy  for
Hemophilia A patients who develop FVIII alloantibodies.

Our strategy is to build upon our first mover advantage in the field of targeted cell therapy for B cell-mediated autoimmune diseases and further
advance  the  discovery,  development  and  commercialization  of  our  CAAR  T  portfolio.  Our  scientific  founders  are  leading  experts  in  B  cell-mediated
autoimmune diseases and CAR T technology, and we are led by an experienced team with demonstrated success in discovering, developing, manufacturing,
and  evaluating  novel  cell  therapy  products  in  clinical  trials.  In  addition,  we  have  partnered  our  discovery  and  initial  development  efforts  with  Penn,  a
pioneer  in  cell  and  gene  therapy  with  a  proven  track  record  of  expertise  in  the  translational  research,  clinical  development  and  manufacturing  of  cell
therapy products, in order to accelerate timelines for our first product candidate to enter clinical trials.

Our History and Team

Our scientific co-founders, Aimee Payne, M.D., Ph.D., and Michael Milone, M.D., Ph.D., began partnering at Penn in 2013 to combine Dr. Payne’s
expertise in B cell-mediated autoimmune diseases with Dr. Milone’s deep and experienced insights into the design and implementation of CAR T products.
Dr. Payne is a worldwide leader in characterizing B cell-mediated autoantibody repertoires in PV and other autoimmune diseases. Dr. Milone is a renowned
scientist in CAR T therapy and was a co-inventor of and a key driver in the preclinical discovery and development efforts that yielded Kymriah, the first
FDA-approved CAR T therapy for the treatment of B cell cancers. Dr. Payne’s laboratory surmised that by incorporating an antigen instead of an antibody
fragment  as  the  extracellular  domain  of  the  CAAR,  specific  pathogenic  B  cells  could  be  targeted.  This  resulted  in  a  collaboration  between  the  two
investigators to apply the scientific foundation of CAR T technology as it has been advanced by Drs. Payne and Milone in order to address B cell-mediated
autoimmune diseases.

Their  first  scientific  publication,  “Reengineering  chimeric  antigen  receptor  T  cells  for  targeted  therapy  of  autoimmune  disease”  (Science,  July
2016),  attracted  the  attention  of  a  colleague,  Steven  Nichtberger,  M.D.,  who  is  an  adjunct  professor  at  the  Wharton  School  at  the  University  of
Pennsylvania,  teaching  a  class  on  biotech  company  formation,  financing  and  leadership  in  the  Vagelos  Life  Sciences  &  Management  Program.
Additionally, Dr. Nichtberger has experience creating and building companies, including a novel cellular therapy company, which required transferring the
technology from an academic institution, establishing a research and development organization, hiring of manufacturing and quality teams, creating novel
manufacturing  processes,  reaching  agreement  with  the  FDA  on  novel  clinical  development  pathways  and  constructing  a  commercial-scale  Good
Manufacturing Practices, or GMP, facility that manufactured autologous cell therapy products for clinical trials. In 2017, based on over a year of interaction
and  discussions  regarding  the  optimal  strategy  to  advance  the  scientific  opportunity  into  a  commercially  developed  product  portfolio  that  could  offer
potentially curative treatment options to patients, Drs. Payne, Milone and Nichtberger decided to launch Cabaletta Bio.

The longstanding and highly productive partnership between our co-founders has been complemented by additional management experience that
brings a successful history of translating academic cellular therapy research from Penn and elsewhere into commercially sponsored clinical trials and the
establishment of a GMP manufacturing facility and organization. Gwendolyn Binder, Ph.D., our Executive Vice President, Science and Technology, was an
early  member  of  the  Translational  Research  Program  Operations  team  at  Penn  for  over  five  years  and  participated  in  the  submission  and  acceptance  of
multiple INDs for novel engineered T cell therapy products. As part of the cell therapy organization at Penn, Dr. Binder partnered with Dr. Milone and
others to drive the IND-enabling translational studies that facilitated the initial CAR T clinical trial in B cell cancers at Penn. Dr. Binder also built and led a
clinical  stage  biotechnology  company’s  manufacturing  operations  and  quality  teams,  including  creation  of  a  fully  functioning  commercial  grade  GMP
facility. Dr. Binder also built the translational research program and ultimately led the company’s research organization.

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Our Research and Manufacturing Collaboration with Penn

Our CABA platform has already produced multiple product candidates through our sponsored research agreements, or SRAs, with Penn for the
laboratories of our scientific co-founders, Drs. Payne and Milone. Our continuing relationship with our scientific co-founders provides important guidance
and insights to us. Our contractual relationship with Penn through ongoing licensing and research arrangements also provides important services around
manufacturing supply.

In July 2019, we amended and restated our worldwide license agreement with Penn to develop our CAAR T technology to treat B cell-mediated
autoimmune and alloimmune diseases. This license agreement provides us with access to multiple patent families covering CAAR T therapy as applied to
the field of B cell-mediated autoimmune and alloimmune diseases and to the robust intellectual property portfolio created by Penn under these SRAs in this
field. See “—Our Material Agreements—Amended and Restated License Agreement with Penn.”

Our ongoing collaboration with Penn is also based on a Master Translational Research Services Agreement, or the Services Agreement, that we
entered into in October 2018, along with multiple additional agreements under the Services Agreement to engage and partner in individual Penn entities,
including  cell  product  manufacturing,  correlative  research,  vector  manufacturing,  clinical  trial  operations  and  protocol  development.  In  addition  to  the
Services Agreement, we have agreements in place with various functional areas and centers that provide additional resources to Penn as well as contractual
commitments  from  Penn  with  the  goal  of  providing  the  capacity  to  manufacture  our  lead  product  candidate,  DSG3-CAART.  Penn  has  also  agreed  to
manufacture vector product for use in our clinical trials. Penn’s obligations are subject to certain limitations and termination rights. See “—Our Material
Agreements—Master Translational Research Services Agreement with Penn”.

We believe Penn is uniquely suited to be our partner in our efforts to develop product candidates leveraging our CAAR T technology based on a
decade of experience, including manufacturing and clinical support for approximately a dozen active cell therapy clinical trials. The original manufacturing
process for the first FDA-approved CAR T therapy was developed at Penn before being transferred to Novartis Pharmaceuticals Corporation during late-
stage  clinical  trials.  We  currently  plan  to  leverage  Penn’s  experience,  validated  standard  operating  procedures,  manufacturing  facilities  and  staffing  to
accelerate initial development efforts for our lead product candidate.

Our Strategy

Our  goal  is  to  build  upon  our  first  mover  advantage  and  expertise  in  cell  therapies  for  B  cell-mediated  autoimmune  diseases  to  accelerate  the
discovery, development and commercialization of our CAAR T cell therapies, with a focus on reliable manufacturing. We believe achieving this goal could
result in potentially curative therapies for patients with unmet medical needs who suffer from certain B cell-mediated autoimmune diseases. To achieve this
goal, key elements of our strategy include:

•

Achieving clinical proof-of-concept for our lead product candidate, DSG3-CAART in mPV, the first in a series of well-understood and
validated B cell-mediated autoimmune diseases for which we are developing CAAR T cell product candidates. It is well-established that
the presence of DSG3 autoantibodies and DSG3 autoantibody producing B cells in patients are both necessary and sufficient to cause mPV
in the vast majority of cases. We believe our biologic understanding coupled with the well-understood clinical signs, symptoms and natural
course  of  the  disease,  identify  mPV  as  a  model  disease  to  evaluate  our  CAAR  T  approach.  In  addition,  we  have  made  significant
investment in the design and development of DSG3-CAART, generating a lead candidate that has demonstrated robust target engagement
and no off-target toxicities in preclinical studies. Taken together, our Phase 1 clinical trial evaluating DSG3-CAART for the treatment of
mPV represents an optimal first opportunity to establish initial clinical proof-of-concept of our CABA platform.

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•

•

•

Leveraging  our  CABA  platform  to  identify  optimal  targets  for  the  CAAR  T  approach  and  apply  learnings  from  DSG3-CAART  to
advance  additional  product  candidates.  Shortly  after  inception,  we  undertook  a  comprehensive  review  of  all  known  B  cell-mediated
autoimmune  diseases  in  order  to  evaluate  and  prioritize  the  opportunity  for  selective  destruction  of  B  cells  in  an  effort  to  cure  B  cell-
mediated  autoimmune  diseases.  Central  to  this  analysis  were  (i)  scientific,  clinical  and  commercial  assessment,  (ii)  epitope  mapping  to
determine regions targeted by autoantibodies, (iii) evaluation of the ability to optimize the CAAR construct and design with the goal of
selectively ablating reactive B cells, and (iv) evaluation of existing or required development of new preclinical models and in vitro and in
vivo clinical testing. As we performed this analysis of potential product candidates, we considered possible paths for clinical trial design
and regulatory approval. This analysis incorporated the extensive learnings gleaned from years of effort devoted to development of DSG3-
CAART. We prioritized the targets and since then have been focused on being first to discover and develop a series of products with each
providing  the  potential  for  cure  of  an  important  B  cell-mediated  autoimmune  disease  in  patients.  We  intend  to  continue  to  apply  our
proprietary  learnings  from  DSG3-CAART,  including  scientific  and  regulatory  learnings,  to  most  effectively  advance  these  additional
opportunities. Preclinical studies that are generally similar to, and informed by, DSG3-CAART preclinical studies are actively ongoing with
other CAAR T cell product candidates.

Expanding  upon  our  established  IP  position  and  first  mover  advantage  in  CAAR  T  therapy  targeted  towards  B  cell-mediated
autoimmune diseases. We are focused on protecting our intellectual property as we continue to pursue the development of future product
candidates. We believe the issued U.S. patent on our initial CAAR constructs is the first patent covering cells engineered to express the
known pathogenic epitopes recognized by DSG3 and DSG1 autoantibodies, which we are working to supplement with additional patent
filings.  The  design  of  a  broadly  effective  CAAR  requires  a  deep  understanding  of  the  location  of  immunogenic  epitopes  targeted  by
autoantibodies, a competency that we believe we are uniquely positioned to utilize in product candidate development. We believe there is a
particularly  high  value  to  the  first  mover  advantage  including,  but  not  limited  to,  experience  in  discovery,  preclinical  development,
regulatory efforts, intellectual property and insights from clinical trials that can be translated across programs.

Leveraging our cellular therapy experience and knowledge in addition to knowledge gained through our Penn collaboration to rapidly
build  our  own  fully-integrated  internal  infrastructure.  We  have  differentiated  expertise  that  we  believe  is  uniquely  suited  for  the
continued buildout of our CABA platform specializing in B cell-mediated autoimmune diseases. Our scientific co-founders who initially
developed our technology continue to collaborate closely with us through SRAs. In addition, our management team has a successful history
of  building  the  capabilities  of  cell  therapy-based  companies  from  the  discovery  and  preclinical  stage  through  Phase  3  readiness.  In
combination with our team, which possesses significant experience in executing on manufacturing strategies for cell therapy products, our
partnership with Penn allows us to utilize their existing infrastructure, which accelerated our ability to submit our first IND. In parallel, we
continue to build out an experienced team to manage the relationship with Penn while also developing and continuing to implement a path
to  our  manufacturing  independence.  Ultimately,  we  intend  to  prepare  and  build  our  own  manufacturing  facility  depending  on  the
achievement of sufficient initial clinical trial data for DSG3-CAART.

7

 
 
 
B Cell-Mediated Autoimmune Diseases: Overview and Current Treatment Paradigm

The body’s immune system, which is designed to protect the body from infection and cancer, includes B cells and T cells. B cells are responsible
for producing antibodies against antigens that the body perceives as foreign whereas T cells are responsible for cell-mediated immunity. In the case of B
cell-mediated autoimmune diseases, certain populations of the patient’s B cells mistakenly produce antibodies directed against normal tissues and cells,
leading to disease. While these autoantibodies are the major effectors of B cell-mediated autoimmune diseases, the underlying root cause of each B cell-
mediated autoimmune disease is the defective B cells that mistakenly make these pathogenic antibodies. These pathogenic B cells express autoantibodies
on their surface with the same antigen specificity as the circulating pathogenic autoantibodies, which can be used to distinguish them from the healthy B
cell population, as shown in the figure below.

Antibodies are B cell receptors that drive B cell maturation. CD19 serves as a B cell marker throughout the naïve B cell phase, while CD20 is a surface
marker expressed later in B cell maturation. CAAR T is designed to eliminate antigen specific B cells and prevent their further development to antibody
producing plasma cells. IgM: immunoglobulin M; IgD: immunoglobulin D; IgA: immunoglobulin A; sIg: surface immunoglobulin, representing the
autoantibody on the B cell surface.

Current  treatment  options  for  autoimmune  mediated  diseases  involve  generalized  immune  suppression,  achieved  through  corticosteroids,
immunosuppressive medications and biologics. Most commonly, corticosteroids are used on both a chronic and acute basis to control disease, and act via a
variety of mechanisms to control or downregulate multiple inflammatory pathways. In many cases, systemic immunosuppressive medications often used in
chemotherapy such as mycophenolate, azathioprine and methotrexate, are added in an effort to minimize symptoms and manage the expected recurrences
in  patients.  Biologic  therapies  have  emerged  as  a  new  class  of  therapies  and  have  a  variety  of  targets  including  cytokines,  B  cells,  and  co-stimulation
molecules. One particular biologic, rituximab, is an anti-CD20 antibody and is employed in multiple autoimmune diseases. Rituximab was approved by the
FDA in 2018 for treatment of moderate to severe PV. Currently existing treatment options target parts of the immune system in addition to disease-causing
B cells, and in general require chronic administration to reduce recurrence rates. We believe the ideal therapy in autoimmune diseases would completely
and specifically eliminate the pathogenic B cells while sparing the immune cells that protect against infection, without requiring chronic administration.

Our Approach

Using our CABA platform, we are developing engineered T cell therapy candidates that express CAARs, which serve as “decoys” for antibodies
expressed  on  the  surface  of  B  cells.  We  believe  these  CAARs  enable  the  T  cells  to  specifically  engage  and  eliminate  pathogenic  B  cells  while  sparing
normal B cells. By harnessing the power of cell therapy, our technology has the potential to overcome the ability of these B cells to evade elimination and
thus lead to durable responses. Our CAAR T platform is based on the foundation of established CAR T therapeutics, differing primarily in their use of the
antigen rather than an antibody fragment to target pathogenic B cells. We

8

 
 
believe our technology has broad applicability and we are building a portfolio of product candidates for B cell-mediated autoimmune diseases.

Background: CAR T Cells

Engineered T cell therapy is a type of immunotherapy in which human T cells are genetically modified to express specific receptors, enabling the T

cells to recognize and eliminate pathogenic cells.

A  key  application  of  engineered  cell  therapy  involves  the  use  of  CARs,  which  are  engineered  molecules  that  enable  T  cells  to  identify  specific
antigens present on the surface of diseased cells. When expressed on the patient’s T cells, the CAR directs the T cells to kill cells that express a particular
antigen. These CAR-expressing T cells, or CAR T cells, can proliferate, generating memory CAR T cells.

Many companies are using CAR T technology to develop therapies for the treatment of B cell cancers. Several drug candidates have demonstrated
clinical success, leading to the first FDA regulatory approvals of CAR T therapies for certain B cell cancers. In these B cell cancers, CAR T therapy has
resulted in complete remission of disease in many patients, even in cancer patients with severe, refractory disease. Despite success in treating certain B cell
cancers, we believe that CARs have not yet been developed or evaluated as a treatment option for other types of B cell-mediated autoimmune diseases in
patients.

Our Technology: CAARs

Our CAAR T platform builds upon the scientific foundation of CARs to enable targeted B cell elimination in an autoimmune setting, which may

lead to complete and durable remission of disease while sparing all other B cell populations that can provide beneficial immunity from infection.

The co-stimulatory domain and the signaling domain of both a CAR T cell and CAAR T cell carry out the same activation and cytotoxic functions
once the engineered cell therapy engages a B cell. Our CAAR T cells differ from CAR T cells primarily in the extracellular targeting domain. Our CAAR T
cells incorporate the relevant parts of the autoantigen that is subject to attack in autoimmune disease, as shown in the figure below.

Key differences between CAR T (left) vs. CAAR T therapy (right). A CAR T cell typically contains a signaling domain and a co-stimulatory domain and
incorporates antibody fragments that recognize a specific antigen, such as CD19, which is present in both B cell leukemia cells and healthy B cells. In
contrast, a CAAR T cell typically contains an antigen as its targeting domain rather than an antibody fragment. The antigen is recognized by the specific,
pathogenic antibody along with the limited population of B cells that produce the antibody. The model CAAR T cell depicted here contains an identical
signaling domain and a co-stimulatory domain. The primary

9

 
 
difference between a CAR T cell and a CAAR T cell is the target domain expressed on the cell surface. The example shown demonstrates the pan-B cell
ablation that happens when targeting the B cell lineage marker, CD19, and the highly selective pathogenic B cell targeting approach of CAAR T.

Potential Advantages of CAAR T Cell Therapy in B Cell-Mediated Autoimmune Diseases

In contrast to currently available therapies for B cell-mediated autoimmune diseases, based on observations of CAR T activity in refractory B cell
cancers, we believe a single CAAR T treatment could potentially offer complete and durable remission of certain specific B cell-mediated autoimmune
diseases while leaving the humoral, or bodily fluid, antibody-producing immune system intact. We believe our CAAR T cells can recognize the specific
autoantibodies  that  are  responsible  for  causing  an  underlying  disease  and  kill  the  cells  that  express  the  autoantibodies  on  their  surface.  As  a  result,  we
believe CAAR T cell therapy used in B cell-mediated autoimmune disease has the potential for durable elimination of pathogenic B cells and an associated
elimination of clinical recurrences with an improved adverse event, or tolerability, profile relative to the current standard of care.

Enhanced target specificity and preservation of humoral immune system

Preservation of the humoral immune system with CAAR T cell therapy represents a potentially meaningful benefit over existing CD19- or CD20-
targeting methods for B cell ablation, as patients would be less susceptible to infection they may encounter after non-specific B cell elimination and would
not require chronic in-hospital treatment with intravenous immunoglobulin, or IVIG, or other prophylactic therapies. Additionally, because self-reactive B
cells  make  up  only  0.01%  to  1%  of  the  normal  B  cell  population,  we  believe  the  risk  of  on-target  toxicity  may  be  reduced  compared  to  systemically
immunosuppressive  medications  that  non-specifically  weaken  the  immune  system.  Continued  use  of  these  drugs  poses  significant  risks,  such  as  the
potential for fatal infections due to the non-specific tempering of the immune system related to the complete depletion of CD20+ or CD19+ B cells.

Potential for complete, long-lasting elimination of pathogenic B cells

The current standard of care for B cell-mediated autoimmune disease displays limited and transient therapeutic benefit while also weakening the
humoral  immune  system.  We  believe  our  CAAR  T  cells  have  the  potential  to  eliminate  the  reactive,  antibody-producing  B  cells  that  are  ultimately
responsible for disease, while sparing normal B cells. The curative potential of CAAR T cells would be consistent with clinical findings from use of CAR T
products in B cell cancers and would be a significant improvement relative to the current standard of care for certain B cell-mediated autoimmune diseases.

While CAR T has demonstrated significant clinical success in B cell cancers, cancer cells employ a variety of mechanisms to evade detection by
targeting immune cells, and antigen escape poses a significant risk of failure for CAR T cell treatment in oncology. Antigen escape in CAR T treatment
occurs when the antigen that the CAR T cell targets is lost from the malignant cell. Clinically, this results in response rates that decline from an initial
complete response level of about 80% to approximately 50% over a period of years.

We believe this risk of antigen escape is reduced in our setting as mechanisms to evade CAAR T therapy would involve B cell receptor down-
regulation  or  mutation  such  that  antigen  specificity  is  lost.  We  believe  that  the  implication  of  this  is  that  the  mutated  B  cell  would  no  longer  produce
autoantibodies that recognize the antigen and therefore should no longer be pathogenic. We also believe that a single infusion of CAAR T cells has the
potential for curative effects due to either complete ablation of pathogenic cells or production of memory CAAR T cells.

10

Our CABA Platform

Our team has developed our CABA platform to inform product candidate development from indication selection through preclinical studies. Using
our CABA platform, our team has identified our highest priority target indications following a rigorous analysis of B cell-mediated autoimmune diseases.
A deep understanding of the antigenic epitopes targeted in these diseases is required to design and construct a successful CAAR. Our scientific founders
have studied B cell repertoires for many years in the context of PV. Their expertise is essential to provide insights and guidance regarding our portfolio of
products. We leverage the experience and insight gained from the development of each product candidate to improve the efficiency of our CABA platform
in evaluating additional potential product candidates.

Scientific, Clinical and Commercial Assessment

Through broad literature review and consultation with internal and external experts, we have identified and continue to monitor the universe of
diseases where pathogenic B cells are implicated in disease pathophysiology. From this set of possible indications, our team then evaluates each disease
based on numerous criteria, which include, but are not limited to:

Biologic Opportunity for Cure

•

•

•

•

•

the presence of the antibody is well established in patients with the clinical manifestations of the disease;

the identified antibody has been shown to be necessary and sufficient in causing clinical disease;

there is a correlation between antibody titer and disease activity;

B cell-depleting therapies are shown or believed to be effective in treating the disease;

the antibody repertoire has been or can be characterized for the disease;

Identifiable and Underserved Patient Populations

•

•

•

a routine and established antibody test exists or can be developed for diagnosis and biomarker assessment;

the clinical course and severity of the disease warrant a cellular therapy despite current standard of care;

products in development do not have the potential to materially improve outcomes versus the current standard of care;

11

 
 
 
 
 
 
 
 
 
 
Evaluation of Preclinical and Clinical Development Pathway

•

•

preclinical in vitro and in vivo models exist or can be developed; and

potential clinical trial designs and endpoints appear reasonable and achievable.

In addition to assessing the underlying biologic and clinical rationale for each potential target, we also assess commercial feasibility of CAAR T
therapy  in  various  B  cell-mediated  indications.  As  part  of  this  assessment,  we  evaluate  the  direct  lifetime  drug  and  overall  healthcare  costs  due  to  the
burden  from  the  disease,  including  the  costs  of  managing  potential  adverse  effects  from  existing  standard  of  care  compared  to  the  potential  CAAR  T
therapy.

We perform this rigorous and detailed conceptual analysis to enable us to be thorough and thoughtful before committing significant resources to a
program. We believe this analysis allows us to prioritize and advance potential product candidates through the CABA platform with a higher degree of
confidence and a higher probability of success.

Epitope Mapping

Epitope mapping involves identifying specific sites on the antigen that are responsible for binding to the antibody of interest. This step is required
in order to facilitate an understanding of CAAR design and feasibility. An understanding of the locations of the key immunogenic epitopes on the antigen
heavily informs the potential feasibility of a CAAR. With an understanding of these epitopes, we then leverage our cell therapy expertise to design the
CAAR construct.

CAAR Construct / Design

Our scientists and collaborators design and create multiple CAAR constructs following completion of epitope mapping, which are tested against
the antibody or antibodies of interest. The goal in CAAR design is to maximize the inclusion of known immunogenic epitopes on the antigen while also
optimizing the size of the construct to improve the ability of the CAAR to bind to the antibody. Determining the location of antigen expression and if there
are  other  antigens  that  may  unintentionally  cross-react  with  the  CAAR  will  also  inform  CAAR  design  and  feasibility.  The  size  of  the  antigen  will  also
determine whether a CAAR can be designed based on the size constraints of the delivery system. Once we have designed and developed optimal CAAR
constructs, we test them in a variety of in vitro and in vivo studies.

In Vitro and In Vivo Testing

In vitro preclinical testing is focused on establishing the specificity and activity of the potential CAAR T cell product candidate against B cells
expressing known pathogenic target antibodies. Specificity is evaluated against non-target membrane proteins that may be expressed on other cells, with
specific focus against any proteins that are known to bind to the antigen presented on the CAAR. CAAR T function is tested in the presence and absence of
soluble,  or  free,  antibodies  isolated  from  patients,  since  these  antibodies  may  enhance  or  inhibit  CAAR  T  cell  function.  Where  relevant  animal  models
exist, the CAAR T cell product candidate is tested in one or more models to address specific questions around safety and the ability of the potential product
candidate to reduce disease activity in vivo.

Pipeline

We are developing a portfolio of CAAR T cell product candidates for the treatment of B cell-mediated autoimmune diseases. Our lead product
candidate, DSG3-CAART, targets B cells that express pathogenic autoantibodies against the DSG3 protein, which cause mPV. The publication of the first
in  vivo  evaluation  of  activity  and  toxicity  of  the  candidate  in  an  animal  model  was  followed  by  additional  preclinical  studies  to  support  our  IND
submission. Our IND was cleared by the FDA in September 2019 and DSG3-CAART was granted orphan drug designation for the treatment of PV by the
FDA in January 2020. We plan to initiate our DesCAARTes™  Trial in 2020. Our next PV-directed product candidate, DSG3/1-CAART, targets B cells that
give rise to pathogenic autoantibodies against either the DSG3 or DSG1 protein, which cause mcPV, and could address a broader PV population.

12

 
 
Our second product candidate, MuSK-CAART, targets B cells that give rise to pathogenic autoantibodies against the MuSK receptor in patients
with MG. An additional product candidate, FVIII-CAART, targets B cells that produce alloantibodies against exogenous FVIII in Hemophilia A patients
who consequently require repeated and increased exogenous FVIII administration. We are exploring additional CAAR T cell product candidates that will
focus on patients with B cell-mediated autoimmune diseases with well-defined antibody targets.

Our Product Candidates

DSG3-CAART for Mucosal PV

Our lead product candidate, DSG3-CAART, is a CAAR T cell therapy expressing DSG3 antigen epitopes as the extracellular domain of a chimeric
immunoreceptor, and is designed to enable specific cytotoxicity toward B cells with DSG3 autoantibody targeting abilities. We believe this strategy has the
potential  to  enable  direct  elimination  of  DSG3  autoantibody  memory  B  cells  and  indirect  elimination  of  DSG3-specific  short-lived  plasma  cells  that
produce the pathogenic autoantibodies.

Scientific, Clinical and Commercial Assessment

PV  is  a  potentially  fatal,  chronic  autoimmune  disease  characterized  by  acantholysis,  which  is  the  loss  of  adhesion  between  cells  of  the  skin  or
mucous membranes. Desmosomes are a collection of proteins that provide the structure for epithelial cells to connect with each other. PV results when
specific  pathogenic  autoantibodies  disrupt  desmosomes  by  targeting  DSG3  and/or  DSG1,  which  are  proteins  that  are  part  of  the  desmosomes.  These
autoantibodies cause the upper layer of the epidermis to split away from its base resulting in characteristic erosions and blisters. Widespread damage to the
skin and mucous membranes increases susceptibility to life-threatening systemic infections. PV has two major subtypes:

•

•

mPV—Characterized by DSG3 autoantibodies only, affecting only mucosal surfaces—accounts for approximately 25% of PV

mcPV—Characterized by DSG3 autoantibodies and DSG1 autoantibodies, affecting both mucosal and cutaneous surfaces—accounts for
approximately 75% of PV

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The presence of DSG-specific antibodies is 98% to 100% sensitive and specific in identifying patients with PV, and these antibodies have been
deemed both necessary and sufficient to cause the disease. Thus, in the absence of DSG autoantibodies, PV generally does not occur. In mPV, patients will
typically develop painful skin blisters on their mucosal membrane surface, including mouth, nose, throat, genitals, and other orifices, often leading to an
inability to eat, drink and function normally. The pathogenic DSG3 autoantibody is made by a specific small number of aberrant B cells, which express the
DSG3 autoantibody on their surface. An overview of mPV and mcPV is provided in the figure below.

Visual evidence of clinical manifestations of PV. (Left panel) Inside of cheek of a patient with mPV, showing sloughing mucosa and blistering. (Right panel)
Back of a patient showing cutaneous skin blistering and sloughing in a patient with mcPV. Image credit: D@nderm.

Like most autoimmune diseases, the current standard of care for PV relies on general immune suppression, which is often transiently effective but
can lead to severe infection, potentially resulting in hospitalization and death. First-line therapy for PV typically consists of corticosteroids in moderate to
high  doses  in  combination  with  the  anti-CD20  monoclonal  antibody  rituximab  where  clinically  appropriate.  Second-line  therapy  focuses  on  the  several
systemically  immunosuppressive  medications  such  as  mycophenolate,  azathioprine  and  methotrexate.  Additional  options  used  in  the  acute  setting  with
severe disease presentation include plasmapheresis, or infusions of intravenous immunoglobulin.

B cell depletion with rituximab was approved by the FDA for the treatment of PV in 2018 and is playing an increasing role as part of the standard
of care because it has proven to be one of the more effective therapies for PV. However, data suggest that a significant number of patients treated with
rituximab will relapse with or without chronic therapy. Despite its recent approval for use as an adjuvant therapy with corticosteroids in PV, rituximab has
several limitations in terms of efficacy, safety and convenience. Rituximab treatment frequently results in relapse, which is reduced but still occurs despite
chronic treatment every six months in PV. It does not specifically target the pathogenic B cells, but rather it depletes all CD20-expressing B cells, which
leads to an ongoing risk of severe infection and death. As such, there remains not only an unmet medical need in PV, but also a need for safer therapies that
can provide a reliable, durable and complete remission off of all other medications.

14

 
 
There are several emerging therapies also being developed for the treatment of PV, which are being evaluated in late-stage clinical trials. These
therapies provide important alternative therapeutic options for patients; however, we believe based on early published data that these therapies are unlikely
to be curative and do not specifically ablate autoantibody producing B cells.

Epitope Mapping

DSG3 consists of five extracellular cadherin, or EC, domains as shown schematically in the figure below. Since T cell activation depends on the
intermembrane  distance  of  the  immunologic  synapse,  we  tested  different  combinations  of  ECs  for  expression  in  primary  human  T  cells  using  DSG3
fragments as the extracellular domain as shown in the figure below.

Image showing the naturally occurring DSG3 protein and the five EC domains. (B) The CAAR constructs that were evaluated in preclinical studies,
containing the whole or subsets of the DSG3 protein. The transmembrane and intracellular signaling domains are identical to those in the CART19 studies
published by Penn.

CAAR Construct / Design

The DSG3 EC1-5 CAAR was minimally functional, likely due to the extracellular domain being too large to enable CAAR function or aggregation
of the CAAR on the T cell surface. The CAAR designs with either DSG3 EC1-3 or DSG3 EC1-4 showed interferon-gamma production after exposure to
the target cells, demonstrating specific cytotoxic activity across targets. In addition, no cytokine production was detected after exposure to cells that did not
express surface immunoglobulins or other non-target cells.

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The DSG3 EC1-3 was not effective against one target cell known to bind to the DSG3 EC3-4 domain. Together, this data suggests that the DSG3
EC1-4 CAAR is the optimal construct to balance activity while retaining the ability to target locations of known pathogenic antibodies, as shown in the
figures below.

Cytotoxicity assay to assess killing activity of DSG3 CAART. Negative control is a CAR T with an antibody fragment attached to the extracellular domain.
* indicates construct that was selected for further development. E:T ratio = effector to target ratio.

16

 
 
In Vitro Studies

A variety of in vitro studies were conducted to evaluate DSG3-CAART from a preclinical activity and toxicity perspective. These studies included
an evaluation of DSG3-CAART against proteins that are known to bind the DSG3 antigen, a screen of DSG3-CAART against an array of other membrane
proteins and a set of studies designed to evaluate the potential effects of soluble DSG3 antibodies against DSG3-CAART. The results of these studies are
summarized below.

Evaluation  of  DSG3-CAART  reactivity  against  known  DSG3  binding  proteins.  The  DSG3  antigen  presented  on  the
extracellular domain of DSG3-CAART may naturally bind proteins in the body. These proteins may bind to and activate DSG3-CAART,
potentially causing toxicity. The native binding proteins for DSG3 are the desmocollin proteins, which are important for cell adhesion in
the skin and mucosa. We performed a variety of studies to test whether DSG3-CAART recognizes and activates the desmocollin proteins.
Epithelial  cells  isolated  from  various  primary  organ  systems  that  express  some  level  of  desmocollin  proteins  were  screened.  Potential
DSG3-CAART  activity  was  evaluated  through  the  detection  of  cytokines  released  against  each  cell  type  and  cytotoxicity.  The  data
demonstrated an absence of inflammatory T cell cytokines after being exposed to these cells, indicating an absence of T cell activation. No
cytotoxicity was detected except at very high, non-pharmacologically feasible doses. Collectively, we believe there is sufficient evidence to
suggest that the DSG3 protein in the context of a CAAR does not meaningfully interact with desmocollin proteins.

Evaluation of DSG3-CAART off-target binding against membrane proteins. A membrane protein array was utilized to screen
the  DSG3-CAART  extracellular  domain  against  5,300  membrane  proteins,  which  encompass  the  approximate  number  of  membrane
proteins  contained  in  the  human  genome.  The  confirmatory  screen  yielded  no  off-target  signals,  except  for  one  weak  signal  against  a
protein that is known to bind to glycoproteins, and which was detected in both the test and control conditions. Further evaluation of this
protein in cell-based assays indicated that DSG3-CAART does not recognize and activate against this protein.

Evaluation of the effect of soluble antibodies on DSG3-CAART function. We expect that circulating antibodies may prompt an
active immune response against treatment with CAAR T cell therapy. These antibodies can induce proliferation of DSG3 CAAR T cells
but may also neutralize the cells. In our preclinical in vitro studies, we observed that while DSG3 antibodies may have a variable effect on
CAAR function, there was no systematic effect to enhance or reduce CAAR function. These dynamics were evaluated in a series of in vitro
studies as follows:

•

•

•

Soluble  DSG3  antibodies  were  added  to  CAAR  T  cell  cytotoxicity  assays,  at  a  range  of  concentrations  likely  to  be
encountered in patients, to assess the impact on CAAR function. In all cases when the CAAR T cells were tested in the
presence of soluble DSG3 antibodies, they retained their killing function. In addition, the presence of antibodies did not
demonstrate  a  systematic  effect  to  enhance  or  reduce  the  CAAR  T  cells’  cytotoxic  ability.  Therefore,  we  believe  that
removal of circulating soluble DSG3 antibodies from patients prior to infusions may not be necessary to enable potential
benefit.

Monoclonal  DSG3  antibodies  with  an  enhancing  effect  were  evaluated  in  combination  with  PV  patient  serum  to  assess
their impact on DSG3 CAAR T cell division and stimulation of cytokine production. Monoclonal DSG3 antibodies were
capable of inducing DSG3 CAAR T cell division and stimulated production of moderate levels of cytokine production, as
measured by interferon gamma. Therefore, we believe the presence of DSG3 autoantibodies in patients may contribute to
the DSG3 CAAR T cell population expansion post-infusion.

Antibodies purified from PV patients were added to DSG3 CAAR T cells at a range of concentrations known to commonly
occur  in  patients  in  order  to  evaluate  the  extent  to  which  patient  serum  may  activate  CAAR  T  cells.  These  antibodies
induced a dose dependent increase in interferon gamma.

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•

Off-target  toxicity  may  also  be  seen  due  to  antibody-mediated  bridging  of  DSG3  CAAR  T  cell  cytotoxicity  against
hematopoietic  cells  that  express  receptors  designed  to  bind  to  antibodies,  known  as  Fc  receptors.  To  evaluate  this,  we
loaded  DSG3  antibodies  onto  cells  expressing  antibody-binding  receptors,  and  evaluated  the  ability  of  DSG3  CAAR  T
cells to bind and activate against these targets in vitro. No evidence of cytotoxicity was observed, suggesting the potentially
low risk of off-target killing mediated by this mechanism.

In Vivo Studies

To evaluate DSG3-CAART in vivo, four murine models were used. These models were designed to directly compare the potency of DSG3-CAART
in  comparison  with  CART19  cells;  evaluate  the  potential  for  on-target  skin  toxicity;  and  measure  the  activity  of  DSG3-CAART  in  the  presence  of
polyclonal soluble DSG3 antibodies.

•

•

•

Evaluation  of  potency  of  DSG3-CAART  in  a  human  B  cell  tumor  line  compared  to  CART19  cells.  This  B  cell  model  contained
genetically-modified B cells to express DSG3 antibodies on the cell surface in addition to luciferase, a bioluminescence marker,
and allowed evaluation of DSG3-CAART’s ability to engage and kill B cells that express the pathogenic antibody. CART19 cells
were used as a positive control in this model as the B cells express CD19 on their cell surface. In this model, DSG3-CAART was
found to result in a similar reduction of B cells compared to the CART19 cells.

Evaluation  of  on-target  skin  toxicity  mediated  by  DSG3-CAART.  A  human  skin-xenografted  model  was  used  to  evaluate  the
potential skin toxicity of DSG3-CAART by evaluating if the extracellular domain would react with desmocollin proteins, which
are  the  known  target  for  DSG3.  These  results  were  compared  directly  to  a  positive  control  CAR T  expressing  a  DSG3  specific
antibody as an extracellular domain. In this model, we observed the absence of skin toxicity mediated by the DSG3-CAART cells
compared to the positive control, which did demonstrate skin toxicity.

Evaluation  of  DSG3-CAART  in  the  presence  of  soluble  antibodies.  We  also  tested  a  model  where  mice  have  circulating  DSG3
antibodies to mimic the situation in PV patients. In this model, the DSG3 antibodies have well-defined and different epitopes with
varying affinities, which may reflect the potential breadth of B cell targets that could be encountered in PV patients. The mice were
then treated with DSG3-CAART, which was compared to non-CAAR expressing T cells, or negative control CAR T cells. In this
model, we observed amelioration of disease (see figure A below), reduction of DSG3 antibody titers (see figure B below), as well
as  control  of  the  pathogenic  B  cells  (see  figure  C  below),  by  DSG3-CAART.  In  this  model,  DSG3-CAART  also  demonstrated
dose-related  activity,  particularly  in  regard  to  reduction  of  serum  autoantibodies,  epithelial-bound  autoantibodies  (not  shown  in
Figures) and DSG3-CAART engraftment, suggesting that higher DSG3-CAART doses may promote engraftment (see Figures D
and E). We believe these results show the functional activity of DSG3-CAART in the presence of soluble antibody.

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Histology showing DSG3 CAAR maintaining normal epithelial cell structure in treated animals.

OD450 is a proxy measure for anti-serum DSG3antibodies in the blood. * indicates statistically significant reduction in DSG3 serum antibody level in
DSG3-CAART treated mice. P value is < 0.05. *** indicates statistically significant increase in DSG3 serum antibody level in the negative control CAR
treated group. P value is < 0.001.

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Total flux is a quantitative measure of cell bioluminescence, which approximates cell activity in this assay.

D

OD450 is a proxy measure for the level serum anti-DSG3 antibodies in the blood. Serum anti-DSG3 ELISA was performed on day 10 for all mice with
remaining serum samples available, indicating that mice treated with the 3x107 and 1x107 DSG3-CAART dose effectively reduced serum anti-DSG3 IgG
production compared to mice treated with NTD T-cells or the 3x106 DSG3-CAART dose.** indicates statistically significant reduction in DSG3 serum
antibody level in DSG3-CAART treated mice. P value is < 0.01. * indicates statistically significant increase in DSG3 serum antibody level in the negative
control CAR treated group. P value is < 0.05. ns indicates a non-significant difference.

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Quantification by flow cytometry of CD3-positive T-cells in peripheral blood on day 10 and 17 is shown.  The data support dose-related DSG3-CAART
engraftment based on increased CD3+ cells with increased DSG3-CAART dose.

•

Evaluation of DSG3-CAART in an active immune model. An exploratory active immune mouse model for PV was developed to
better  represent  the  human  phenotype  in  autoimmune  disease.  This  model  involved  generating  anti-DSG3  B  cells  in  a  mouse
without  DSG3  by  repeated  immunization  with  human  DSG3.  Splenocytes  containing  anti-DSG3  B  cells  from  the  immunized
mouse  were  transferred  into  an  immunodeficient  mouse  to  generate  the  PV  phenotype.  These  mice  produced  DSG3  antibodies
against multiple extracellular domains of the DSG3 antigen, including EC5, at physiologic levels comparable to those observed in
PV  patients.  Treatment  with  DSG3  EC1-4  CAAR  T  cells,  in  the  absence  of  preconditioning,  effectively  lowered  serum  DSG3
antibody  levels  by  ELISA,  reduced  antibodies  against  relevant  DSG3  domains  by  epitope  mapping  and  reduced  blistering  by
histology.  These  mice  retained  autoantibodies  targeting  the  DSG3  EC5  region,  though  the  mice  did  not  show  clinical
manifestations of PV.

•

See figure F below for a schematic representation of the experiment.

F

Schematic representation of the PV active immune model. A DSG3 knockout mouse is immunized with DSG3 EC1-5. The knockout mouse develops
antibodies against DSG3 across all EC domains. The splenocytes from the knockout mouse are transferred to an immunodeficient mouse where the DSG3
antibodies cause a clinical phenotype consistent with PV. Those mice are then treated with DSG3-CAART (EC1-4 domains only).

Clinical Development Plan

We  submitted  an  IND  to  the  FDA  for  a  Phase  1  trial  of  DSG3-CAART  in  August  2019.  The  FDA  accepted  our  IND  for  DSG3-CAART  in
September 2019 and granted orphan drug designation to DSG3-CAART for the treatment of PV in January 2020. Based on communications with the FDA,
we expect that the DSG3-CAART trial

21

 
 
 
 
 
 
 
 
 
will be designed as a Phase 1, open-label trial to assess the safety and tolerability of various dosing regimens of DSG3-CAART in the treatment of subjects
with active mPV. DSG3-CAART will be administered by intravenous infusion, using a fractionated-dose infusion scheme of escalating numbers of DSG3-
CAART cells for the initial cohorts in the first phase. This dosing scheme is designed to reduce the potential risks associated with acute infusion-related
toxicities while preserving potential benefit for subjects by allowing a total infused dose that we believe is large enough to be potentially therapeutic based
on prior CAR T trials.

We expect that the Phase 1 trial will have three parts:

•

•

•

Part A: Fractionated dose escalation

Part B: Fractionation reduction at the selected dose

Part C: Expansion phase at the selected dose and administration scheme

In Part A, the split dose uses dose fractionation to accommodate a low number of cells in the first infusion while still advancing the dose within the
cohort up towards and spanning the range of cell doses that have been therapeutic in past gene-engineered T cell therapy trials. In Part B, the dose selected
from Part A will be delivered in a decreasing number of dose fractionations to determine the dose fractionation strategy. In Part C, subjects will be enrolled
at the dose and fractionation, as determined in Part A and B, to generate additional safety and outcome data to support the rationale for and design of future
clinical trials.

Patients are eligible to be enrolled if they have a confirmed diagnosis of mPV based on biopsy for histology and positive DSG3 ELISA; active
disease  at  screening;  elevated  DSG3  by  ELISA  at  screening;  and  previously  been  inadequately  managed  by,  or  refractory  to,  or  relapsed  after,  or  with
contraindications to or intolerance of at least two prior systemic therapies. The primary objective of the trial is to evaluate the safety of DSG3-CAART
cells, and secondary objectives include evaluating the initial signs of target engagement.

We believe the risk of cytokine release syndrome, or CRS, a potentially life-threatening toxicity that has been observed after treatment with some
types of immunotherapy, may be reduced with our CAAR T cells, due to its correlation with target cell burdens. In the context of treating cancer, the target
cell population consists of all B cells (healthy and cancerous), whereas our CAAR T cells only target the small subset of disease-causing reactive B cell
population. While the possibility of cytokine release in a clinical trial resulting from strongly activating soluble antibody cannot be ruled out, to date we
have not observed any evidence of it in preclinical studies.

The  primary  endpoint  of  the  study  is  the  incidence  of  adverse  events  within  three  months  of  DSG3-CAART  infusion,  including  dose  limiting
toxicity defined as occurring within 28 days of infusion. The FDA has requested, and we have agreed, that we will share data from cohort A to inform a
discussion on the optimal design of cohort C. According to FDA guidance, the submission of cohort A data is not gating to planned enrollment in cohort B
and the FDA plans to provide feedback, if any, in a timely manner. In addition, we plan to report on acute tolerability data on no less than a cohort basis,
which is defined to include adverse events within eight days following DSG3-CAART infusion. We believe the eight-day timeframe appropriately covers
the period of time when one would expect the onset of CRS in most subjects. We also currently intend to communicate serious adverse events once we
have sufficient understanding of the events, if they materially change timelines or the trial design.

We also expect to provide updates from time-to-time related to target engagement in subjects receiving DSG3-CAART typically only once data is
available  for  a  full  cohort.  Although  possible  but  not  expected  in  the  lower  dosing  cohorts,  we  believe  target  engagement  could  be  observed  if  DSG3
autoantibody titer falls within six months after DSG3-CAART infusion in addition to other parameters of engraftment and target engagement that will be
monitored regularly. Clinical responses, including improvement or resolution of mucosal lesions and absence of new lesions will also be evaluated.

DSG3/1-CAART for mcPV

Scientific and Commercial Assessment

Our next PV product candidate, DSG3/1-CAART, is being designed to target DSG3 and/or DSG1 autoantibodies on pathogenic B cells that cause

mcPV. mcPV is the most severe and most common subtype of PV

22

 
 
 
and affects approximately 75% of PV patients. While mPV is caused by DSG3 autoantibodies, mcPV involves autoantibodies to both DSG3 and DSG1,
resulting in the additional involvement of skin erosion and blistering. Similar to mPV, mcPV is typically treated with immune suppression, which has a
high rate of relapse and potential for hospitalizations and fatal infections.

Epitope Mapping

DSG1 consists of five EC domains, with all known pathogenic epitopes occurring in the DSG1 EC1-4 domains. Similar to development of DSG3-
CAART, we tested different combinations of DSG1 ECs for expression in primary human T cells using DSG1 fragments as the DSG1 EC domains. Given
prior development of DSG3 CAAR, we leveraged those findings in the design of our DSG1 CAAR.

CAAR Construct / Design

We also tested multiple combinations of EC domains of DSG1 CAAR administered alone and in combination with the DSG3 EC1-4 CAAR to
evaluate for cell-surface expression of the CAAR along with the potency and breadth of target cell killing. In this setting, the DSG1 EC1-4 CAAR showed
robust and specific cytotoxicity towards all known pathogenic epitopes.

In Vitro Studies

CAAR  development  for  mcPV,  based  on  the  targeting  of  DSG3-  and/or  DSG1-specific  B  cells,  has  shown  promising  preclinical  results.  DSG1
CAAR T cells specifically killed DSG1-specific B cells in vitro. In addition, we observed that with a 1:1 mixture of DSG3 and DSG1 CAAR T cells had
killing capabilities without synergistic or antagonistic effect.

In Vivo Studies

The activity and toxicity of DSG3 and DSG1-CAAR T cells was evaluated using human skin xenografts in comparison with anti-CART19 cells,
which are known from human clinical trials not to cause direct skin toxicity. A 1:1 mixture of DSG3 and DSG1 CAAR T cells did not show off-target
toxicity in vivo.

Development Plan

From  a  regulatory  and  clinical  trial  design  perspective,  we  anticipate  that  many  of  the  elements  incorporated  into  the  planned  DesCAARTesTM
Trial will carry over to DSG3/1-CAART. We plan to evaluate the initial cohorts of patients from the planned DesCAARTesTM Trial to evaluate for safety
and evidence of target engagement prior to proceeding with an IND submission for DSG3/1-CAART. We believe that, because mcPV is the most prevalent
subset  of  PV  and  the  patients  are  generally  followed  by  the  same  subspecialists,  it  will  allow  for  a  wider  patient  pool  eligible  for  a  clinical  trial.  We
anticipate the DSG3/1-CAART clinical trial protocol will have a significant amount of overlap with the DSG3-CAART protocol, but it will be informed by
clinical data from the early cohorts in the DesCAARTesTM Trial. We further anticipate being able to use the same centers from the DesCAARTesTM Trial
to enroll patients for the DSG3/1-CAART clinical trials.

We  are  currently  evaluating  advanced  manufacturing  technologies  that  would  potentially  allow  us  to  administer  DSG3/1-CAART  as  a  single
product rather than requiring separate administration. The size of the DSG3/1 product candidate will likely require us to incorporate additional technologies
to accommodate the size of the final CAAR construct. An evaluation of potential technologies to achieve this objective is ongoing. Upon completing the
evaluation of these manufacturing technologies, we expect to conduct additional in vitro and in vivo studies using the combined product. While a product
that  administers  a  DSG3  CAAR  and  DSG1  CAAR  as  two  separate  products  may  be  feasible,  we  believe  that  there  would  be  significant  advantages  to
developing a combined product from a regulatory and commercial perspective.

23

MuSK-CAART for MuSK Myasthenia Gravis

Scientific, Clinical and Commercial Assessment

MG is an autoimmune disease induced by autoantibodies targeting the neuromuscular junction, or NMJ, which can lead to life-threatening muscle
weakness. Generalized MG, or gMG, is characterized by profound muscle weakness throughout the body, resulting in motor impairment, disabling fatigue,
shortness of breath due to respiratory muscle weakness and episodes of respiratory failure.

gMG affects approximately 65,000 to 70,000 patients in the United States. The majority of patients who develop gMG have autoantibodies against
some part of the NMJ that are known to be pathogenic. 80% to 90% of patients with gMG have autoantibodies against the acetylcholine receptor, or AchR,
detectable in their serum. Approximately 6% to 7.5% of patients with gMG have autoantibodies against MuSK, which is a different target on the surface of
the muscle membrane.

Patients  diagnosed  with  MuSK  MG  have  a  different  recommended  treatment  course  compared  to  patients  with  AchR  MG.  Importantly,  many
patients with MuSK MG respond poorly to cholinesterase inhibitors, which are often the first line of therapy in AchR MG. In that setting, patients with
MuSK MG are typically started on corticosteroids in addition to one or more steroid-sparing immunosuppressive agents. Corticosteroids are tapered to the
extent  possible  to  prevent  disease  relapse,  though  many  remain  dependent  on  corticosteroid  despite  concomitant  treatment  with  immunosuppressive
medications. In the acute setting, plasmapheresis or intravenous immunoglobulin may be used to address severe disease. Rituximab is often considered as a
second-line therapeutic option in patients with an inadequate response to initial immunosuppressive medications. Importantly, complement is not thought to
be meaningfully implicated in the pathophysiology of MuSK MG, and complement inhibitors are not indicated for treatment of disease.

Epitope Mapping

The MuSK protein has a similar structure and size as compared to DSG3. MuSK contains four extracellular domains, as shown below.

Figure illustrating the domains of the wild-type MuSK protein.

24

 
 
Studies conducted in patients with MuSK MG have revealed that the autoantibodies may be against epitopes located in each of the extracellular

domains for MuSK.

CAAR Construct and Design

With  an  understanding  that  pathogenic  autoantibody  epitopes  may  target  any  domain  of  MuSK,  multiple  MuSK  CAAR  candidates  have  been

engineered that incorporate all extracellular domains. Each CAAR construct is being or will be tested in preliminary in vitro and in vivo experiments.

Development Plan

The initial in vitro studies with our MuSK-CAART product candidate have been completed. These studies were followed by preliminary in vivo
studies to evaluate toxicity of the MuSK-CAAR construct along with evaluation of target engagement. We presented data from preclinical in vitro studies
evaluating  MuSK-CAART  activity  at  the  American  Neurological  Association  annual  meeting  in  October  2019.  At  the  conference,  data  was  presented
showing that MuSK CAAR T cells containing the native MuSK extracellular domain were able to specifically kill B cells expressing anti-MuSK antibodies
that  target  different  MuSK  epitopes.  Additionally,  MuSK  CAAR  T  cells  did  not  demonstrate  cytotoxicity  toward  cells  expressing  LRP4,  which  is  a
different protein in the neuromuscular junction that can bind with MuSK in certain configurations.

Data  from  our  preliminary  in  vitro  and  in  vivo  studies  of  MuSK-CAART  has  been  accepted  for  presentation  at  the  American  Academy  of
Neurology’s  annual  meeting  in  April  2020,  but  the  meeting  was  subsequently  cancelled  due  to  the  COVID-19  pandemic  and  an  alternative  venue  for
presentation  has  not  yet  been  provided.  The  efficacy  and  safety  of  MuSK  CAAR  T  cells  were  investigated  using  in vitro  cytotoxicity  assays,  in  vitro
screens for off-target toxicity and a mouse model to evaluate the efficacy of human MuSK CAAR T cells against MuSK antibody expressing B cells in
vivo. MuSK CAAR T cells demonstrated specific cytotoxicity toward a panel of MuSK antibody expressing B cells targeting different MuSK epitopes.
Cytotoxicity toward cells expressing LRP4 was not observed. In the mouse model, MuSK CAAR T cells, but not non-transduced or control CAAR T cells,
suppressed the expansion of MuSK antibody expressing B cells.

FVIII-CAART for Hemophilia A with Factor VIII Alloantibodies

While our CABA platform is primarily directed towards the treatment of B cell-mediated autoimmune diseases, we believe the approach may be
applicable in other instances where B cell antibody production is implicated. Specifically, we have identified an opportunity to apply the CABA platform to
develop potential CAAR adjunctive therapies in cases where the immune system has or produces antibodies against potential therapies, which is known as
an  alloimmune  response.  These  alloantibodies  can  prevent  a  particular  therapy  from  being  delivered  effectively  because  the  therapy  is  degraded  by  the
immune response due to alloantibody binding. We believe our approach has the potential to address the alloantibody response by specifically ablating the B
cells responsible for producing the alloantibodies through a similar mechanism seen in autoimmune disease. With the alloantibody producing cells ablated,
the treatment could then be provided.

Scientific, Clinical and Commercial Assessment

Hemophilia A is an X-linked bleeding disorder caused by mutations in the FVIII gene resulting in a deficiency of functional FVIII, a critical factor
in blood coagulation. It affects about 1:5,000 male births. Severe Hemophilia A, where FVIII levels are less than 1% of normal, accounts for about 60% of
all cases and is characterized by frequent spontaneous bleeds. Currently, Hemophilia A is treated with FVIII replacement via intravenous administration.

The main complication of FVIII replacement therapy is that 20% to 30% of patients with severe disease develop neutralizing alloantibodies against
the  FVIII  protein.  These  alloantibodies  decrease  the  levels  of  FVIII  and  at  high  titers,  render  attempts  to  replace  or  stimulate  the  production  of  FVIII
ineffective.  The  risk  of  alloantibody  development  for  patients  with  severe  Hemophilia  A  is  highest  during  their  initial  FVIII  exposures.  The  standard
treatment  to  reverse  alloantibody  formation  consists  of  repeated  high-dose  infusions  of  FVIII,  which  has  limited  efficacy,  a  high  cost  and  is  difficult  to
titrate to an appropriate therapeutic level for the patient. We believe FVIII-

25

CAART could be effective in addressing patients with Hemophilia A who have developed FVIII antibodies that require repeated, high-dose administrations
of FVIII.

Epitope Mapping

The following image depicts FVIII, which is a large glycoprotein consisting of six domains that interact with each other to form the full complex.

Studies conducted in patients with Hemophilia A have revealed that acquired FVIII alloantibodies following exogenous FVIII administration are

typically directed against A2, C1 and C2 domains of FVIII.

CAAR Construct and Design

Preliminary FVIII CAAR and CAAR-like constructs have been engineered that target parts, but not all, of the FVIII domains. Dr. Milone, one of

our scientific co-founders, has led the development of one such construct.

Development Plan

Internally, we are conducting additional studies to optimize our FVIII-CAART development. The focus of these studies will be to fully characterize
any additional pathogenic epitopes and construct a FVIII-CAART that includes additional FVIII domains. Given the size of the FVIII protein, this will
likely require us to incorporate additional technologies to reduce the size of the final CAAR construct. An evaluation of potential technologies to achieve
this objective is ongoing.

Manufacturing

Manufacturing Strategy

We intend to implement a three-stage plan that we believe will ultimately enable us to achieve manufacturing independence. Part of our strategy
relies  on  engaging  non-profit  and  commercial  suppliers  early  and  in  a  staged  manner.  We  believe  partnering  with  proven  and  reputable  manufacturing
partners will allow us to efficiently deploy financial and personnel resources. Stage 1 of this plan is in place and utilizes the deep expertise in cell and
vector manufacturing from our partners at Children’s Hospital of Philadelphia, or CHOP, and Penn. This includes early development work, support of the
DSG3-CAART IND, and cell and vector product manufacturing for our DesCAARTesTM Trial. We believe these facilities will allow us to move efficiently
into clinical trials but are not sufficient to support a commercial license.

26

 
 
Stage 2 of our plan is designed to engage partners who are qualified for manufacturing of vector at commercial grade and scale and cell therapy
products. We are aware that changes in any manufacturing process or facility introduces regulatory and scientific risk to a development program, if the
changes result in a product that is not comparable. We plan to mitigate these risks primarily in two ways:

1.

2.

By securing contract development and manufacturing organizations, or CDMOs, partners during Stage 2 of our manufacturing strategy
early on for both vector and cell manufacturing. We plan to prioritize potential partners who are qualified to, and have an established track
record  of,  the  commercial  production  of  vector  and  cell  products.  We  believe  this  allows  us  to  make  one  change  in  our  supply  partners
during an early period of clinical development to facilitate in vitro comparability testing and clinical validation, prior to controlled clinical
studies.

By licensing the cell manufacturing process used for our planned Phase 1 DSG3-CAART first-in-human study from Penn. We believe this
will provide time to enable us to understand the process used in order to reduce the chance of changes that may impact comparability.

In addition to Stage 2, and contingent on sufficient clinical evidence from our planned DesCAARTesTM Trial, we are further planning to pursue
Stage 3 in manufacturing supply. During Stage 3, we plan to build, qualify and run our own manufacturing facility. We believe this additional stage will
enable  full  control  of  continuous  improvement,  product  development  and  commercial  supply  for  products  arising  from  our  CABA  platform.  Our  Chief
Executive Officer and Executive Vice President, Science and Technology have both, in prior roles, built and led organizations that have constructed and
commissioned cell therapy facilities.

Vector Manufacturing

The lentiviral vector that we plan to use in the initial subjects in our Phase 1 clinical trial for DSG3-CAART was manufactured at CHOP. We have
also  reserved  multiple  vector  manufacturing  slots  at  Penn,  which  we  may  use  in  our  DSG3-CAART  or  subsequent  clinical  trials.  In  parallel,  we  are
engaging  in  development  work  with  multiple  CDMOs  with  a  plan  to  secure  production  slots  for  vector  which  may  be  used  in  our  DSG3-CAART  or
subsequent clinical trials. We believe these efforts will provide us with sufficient clinical-grade vector to move forward with our anticipated clinical trials.

Cell Manufacturing

We  have  entered  into  a  collaboration  with  the  Clinical  Cell  and  Vaccine  Production  Facility,  or  CVPF,  at  Penn,  to  provide  focused  scientific,
technical and regulatory support for CAAR T cell manufacture. CVPF is accredited by the Foundation for the Accreditation of Cellular Therapy and is
capable of and experienced at supporting manufacture for early-phase clinical trials of novel cell therapy products in first-in-man clinical trials. We expect
to  rely  upon  CVPF  to  provide  initial  Phase  1  clinical  trial  drug  supply  for  DSG3-CAART.  Penn’s  manufacturing  process  for  DSG3-CAART  is  directly
related to the process developed at Penn for early clinical trials of CART19, which subsequently became known commercially as Kymriah. The process
was later transferred to Novartis Pharmaceuticals Corporation and further modified for the Kymriah program.

As we scale our manufacturing of DSG3-CAART and our other product candidates to meet our expected needs for further clinical trials, we may or
may not rely on Penn, but we also expect to rely on CDMOs and other third parties for the manufacturing and processing of our clinical trial materials. Any
CDMO that we select will be subject to cGMP requirements. We believe the use of contract manufacturing for our pipeline programs will be cost-effective
and allow us to rapidly prepare for clinical trials in accordance with our development plans. In preparation for this transition, we have engaged multiple
third-party  contractors  to  manufacture  clinical  grade  viral  vector  used  to  deliver  the  applicable  CAAR  gene  into  the  T  cells.  We  have  also  initiated
development work with certain contractors for cGMP and commercial vector production. We expect third-party manufacturers will be capable of providing
and processing sufficient quantities of our product candidates to meet anticipated clinical trial demands and commercial need.

27

 
 
Once  we  have  sufficient  clinical  data  from  subjects  in  our  DSG3-CAART  study,  we  intend  to  begin  the  process  of  engineering  and  then
establishing  our  own  commercial  scale  GMP-compliant  manufacturing  facility.  We  believe  this  will  allow  us  to  enhance  supply  chain  control,  increase
supply  capacity  and  help  ensure  clinical  and  commercial  demand  for  our  pipeline  programs  is  met  in  the  event  that  DSG3-CAART  receives  marketing
approval.  Informed  by  our  experience  in  building  cell  therapy  facilities  and  creating  supply  chains,  we  plan  to  develop  a  robust  supply  chain  with
alternative  sources  to  maintain  continuous  supply.  In  parallel  with  these  activities,  we  are  evaluating  and  executing  proof-of-concept  studies  to  test
advanced manufacturing and automation technologies to continuously improve the manufacturing process and meet commercial and scalability targets.

Commercialization

Our  aim  is  to  become  a  fully  integrated  cellular  therapy  company  in  order  to  improve  the  lives  of  patients  with  B  cell-mediated  autoimmune
diseases. We have designed a strategic approach to move forward with our lead product candidate, DSG3-CAART, while at the same time having a number
of  product  candidates  in  development.  The  product  candidates  from  our  CABA  platform  address  clinical  indications  where  there  is  a  compelling
opportunity  to  improve  clinical  outcomes  in  comparison  with  the  current  standard  of  care  in  an  easily  identified  patient  population.  Our  initial  product
candidates are focused on rare disease populations where we believe there is potential to commercialize independently. This is due to a concentration of
treatment paradigms and limited but easily identified patient populations. Our plan is to focus commercialization and launch efforts initially in the United
States, and eventually in the European Union and Asia-Pacific geographies.

Competition

The biotechnology and pharmaceutical industries are characterized by rapidly advancing technologies, intense competition and a strong focus on
intellectual  property.  We  face  competition  from  many  different  players,  including  large  and  specialty  pharmaceutical  and  biotechnology  companies,
academic research organizations and governmental agencies. Any therapeutic candidates we successfully develop and commercialize will compete with the
existing standard of care as well as any novel therapies that may gain regulatory approval in the future.

Existing treatment options for PV are limited. Rituximab, marketed by Roche Holding AG, is the first drug to have received approval for PV in the
United States in over 60 years. In Europe, the approved therapies for PV are corticosteroids, azathioprine and rituximab. Other standard of care treatments
include  various  immunosuppressants,  plasmapheresis,  and  intravenous  immunoglobulin  infusions  given  monthly  or  on  another  periodic  chronic  basis.
Additionally, multiple biopharmaceutical companies have therapies in clinical development.

Competition in the MuSK MG autoimmune space is currently dominated by the current standard of care, rituximab. A second approved approach
to treating patients is IVIG, which is available through CSL Behring LLC, Grifols, S.A., and Mitsubishi Tanabe Pharma Corporation. Additionally, multiple
biopharmaceutical companies have therapies in clinical development.

Multiple therapies are approved or in development for the treatment of Hemophilia A patients who develop alloantibodies against FVIII. Standard
of  care  is  typically  immune  tolerance  induction,  or  ITI,  therapy  with  higher  doses  of  FVIII.  Available  treatments  for  those  who  do  not  respond  to  ITI
include anti-inhibitor coagulation complexes, recombinant factor VIIa, and bispecific factor IXa- and factor X-directed antibodies. Companies who market
products  or  are  developing  product  candidates  within  these  categories  of  medicine  include  Catalyst  Pharmaceuticals,  Inc.,  Novo  Nordisk  A/S,  OPKO
Health, Inc., Roche Holding AG and Takeda Pharmaceutical Company.

28

We believe we are the first and only company developing CAAR T drug candidates for the treatment of B cell-mediated autoimmune diseases.
However, despite the significant differences in discovery, development and target populations between oncology and autoimmune targets, we recognize that
companies  with  an  investment  and  expertise  in  CAR  T  cell  development  for  oncology  indications  could  attempt  to  leverage  their  expertise  into  B  cell-
mediated autoimmune disease-affected populations. We are aware of biotechnology companies that are exploring other methods of engineering T cells for
the treatment of autoimmune conditions. In addition, some biotechnology companies are engineering red blood cells to incorporate self-antigens with the
goal of tolerizing the immune system to treat autoimmune and alloimmune conditions.

Many  of  the  companies  against  which  we  are  competing  or  against  which  we  may  compete  in  the  future  have  significantly  greater  financial
resources  and  expertise  in  research  and  development,  manufacturing,  preclinical  testing,  conducting  clinical  trials,  obtaining  regulatory  approvals  and
marketing approved products than we do. Mergers and acquisitions in the pharmaceutical and biotechnology industry may result in even more resources
being concentrated among a smaller number of our competitors. Smaller or early stage companies may also prove to be significant competitors, particularly
through  collaborative  arrangements  with  large  and  established  companies.  These  competitors  also  compete  with  us  in  recruiting  and  retaining  qualified
scientific  and  management  personnel  and  establishing  clinical  trial  sites  and  patient  registration  for  clinical  trials,  as  well  as  in  acquiring  technologies
complementary to, or necessary for, our programs.

Intellectual Property and Barriers to Entry

We  strive  to  protect  the  proprietary  technologies  that  we  believe  are  important  to  our  business,  including  pursuing  and  maintaining  patent
protection  intended  to  cover  our  product  candidates  and  their  use,  as  well  as  other  inventions  that  are  important  to  our  business.  In  addition  to  patent
protection, we also rely on know-how, confidentiality agreements, invention assignment agreements and trade secrets to protect aspects of our business that
are not amenable to, or that we do not consider appropriate for, patent protection, to develop and maintain our proprietary position. The confidentiality
agreements are designed to protect our proprietary information and the invention assignment agreements are designed to grant us ownership of technologies
that are developed for us by our employees, consultants or certain other third parties. We seek to preserve the integrity and confidentiality of our data and
trade secrets by maintaining physical security of our premises and physical and electronic security of our information technology systems. While we have
confidence in our agreements and security measures, either may be breached, and we may not have adequate remedies. In addition, our trade secrets may
otherwise become known or independently discovered by competitors.

Our commercial success depends in part upon our ability to obtain and maintain patent and other proprietary protection for commercially important
technologies, inventions and trade secrets related to our business, defend and enforce our intellectual property rights, particularly our patent rights, preserve
the confidentiality of our trade secrets and operate without infringing valid and enforceable intellectual property rights of others.

The patent positions for biotechnology companies like us are generally uncertain and can involve complex legal, scientific and factual issues. In
addition, the coverage claimed in a patent application can be significantly reduced before a patent is issued, and its scope can be reinterpreted and even
challenged  after  issuance.  As  a  result,  we  cannot  guarantee  that  any  of  our  product  candidates  will  be  protectable  or  remain  protected  by  enforceable
patents.  We  cannot  predict  whether  the  patent  applications  we  are  currently  pursuing  will  issue  as  patents  in  any  particular  jurisdiction  or  whether  the
claims of any issued patents will provide sufficient proprietary protection from competitors. Any patents that we hold may be challenged, circumvented or
invalidated by third parties.

As  of  February  1,  2020,  our  patent  estate  (all  of  which  has  been  in-licensed)  included  one  issued  U.S.  patent,  seven  pending  U.S.  patent

applications, and 14 pending foreign patent applications. See “—Our Material Agreements—Amended and Restated License Agreement with Penn.”

With regard to our DSG3-CAART and DSG3/1-CAART product candidates, we have one issued U.S. patent with claims directed to a genetically
modified  cell  containing  a  chimeric  autoantibody  receptor  containing  an  extracellular  domain  containing  DSG3,  DSG1  or  fragments  thereof,  which  is
scheduled  to  expire  in  2035,  without  taking  a  potential  patent  term  extension  into  account.  We  also  have  four  pending  U.S.  patent  applications  and
counterpart patent applications pending in Canada, China and Europe, which if issued, would be expected to expire in 2035. This patent family is owned by
Penn and exclusively licensed to us in the field of the license.

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With regard to our MuSK-CAAR T cell product candidate, we have one pending U.S. patent application and one pending International, or PCT,
patent application, which if issued, would be expected to expire in 2039. This patent family is owned by Penn and exclusively licensed to us in the field of
the license.

With regard to our FVIII-CAAR T cell product candidate, we have one pending U.S. patent application and counterpart patent applications pending
in Australia, Canada, China, Europe, Japan, Hong Kong, Korea, Mexico, New Zealand, and Russia, which if issued, would be expected to expire in 2037.
This patent family is co-owned by Penn and CHOP and is exclusively licensed to us in the field of the license.

The term of individual patents depends upon the legal term of the patents in the countries in which they are obtained. In most countries in which we

file, the patent term is 20 years from the earliest date of filing a non-provisional patent application.

In the United States, the term of a patent covering an FDA-approved drug may be eligible for a patent term extension under the Hatch-Waxman Act
as  compensation  for  the  loss  of  patent  term  during  the  FDA  regulatory  review  process.  The  period  of  extension  may  be  up  to  five  years  beyond  the
expiration of the patent, but cannot extend the remaining term of a patent beyond a total of 14 years from the date of product approval. Only one patent
among those eligible for an extension may be extended, and a given patent may only be extended once. Similar provisions are available in Europe and in
certain other jurisdictions to extend the term of a patent that covers an approved drug. It is possible that issued U.S. patents covering each of our product
candidates may be entitled to patent term extensions. If our product candidates receive FDA approval, we intend to apply for patent term extensions, if
available, to extend the term of patents that cover the approved product candidates. We also intend to seek patent term extensions in any jurisdictions where
they  are  available,  however,  there  is  no  guarantee  that  the  applicable  authorities,  including  the  FDA,  will  agree  with  our  assessment  of  whether  such
extensions should be granted, and even if granted, the length of such extensions.

In addition to patent protection, we also rely on know-how and trade secret protection for our proprietary information that is not amenable to, or
that  we  do  not  consider  appropriate  for,  patent  protection,  to  develop  and  maintain  our  proprietary  position.  However,  trade  secrets  can  be  difficult  to
protect. Although we take steps to protect our proprietary information, including restricting access to our premises and our confidential information, as well
as  entering  into  agreements  with  our  employees,  consultants,  advisors  and  potential  collaborators,  third  parties  may  independently  develop  the  same  or
similar proprietary information or may otherwise gain access to our proprietary information. As a result, we may be unable to meaningfully protect our
know-how, trade secrets, and other proprietary information.

In  addition,  we  plan  to  rely  on  regulatory  protection  based  on  orphan  drug  exclusivities,  data  exclusivities,  and  market  exclusivities.  See  “—

Government Regulation” for additional information.

Our Material Agreements

Amended and Restated License Agreement with the Trustees of the University of Pennsylvania and the Children’s Hospital of Philadelphia

In  July  2019,  we  entered  into  an  amended  and  restated  license  agreement,  or  the  License  Agreement,  with  Penn  and  CHOP,  collectively  the
Institutions, pursuant to which we obtained (a) a non-exclusive, non-sublicensable, worldwide research license to make, have made and use products in two
subfields of use, (b) effective as of October 2018, an exclusive, worldwide, royalty-bearing license, with the right to sublicense, under certain patent rights
of  the  Institution  to  make,  use,  sell,  offer  for  sale  and  import  products  in  the  same  two  subfields  of  use,  and  (c)  effective  as  of  October  2018,  a  non-
exclusive,  worldwide,  royalty-bearing  license,  with  limited  rights  to  sublicense,  under  certain  of  Penn’s  know-how,  which  know-how  satisfies  certain
criteria and is listed on a mutually agreed-to schedule, to make, have made, use, sell, offer for sale, import and have imported products in the same two
subfields of use. Our rights are subject to the rights of the U.S. government and certain rights retained by the Institutions.

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Unless earlier terminated, the License Agreement will expire with respect to a product upon the later of (a) the expiration of the last to expire patent
or patent application covering such product or (b) 10 years after the first commercial sale of such product. We may terminate the License Agreement in its
entirety or on a subfield-by-subfield basis at any time for convenience upon a certain number of days’ prior written notice. Penn may terminate the License
Agreement in its entirety or on a subfield-by-subfield basis for our uncured material breach, including for our failure to meet certain diligence obligations
and milestone events. We, however, may extend the achievement date of any milestone event for an additional period of time by making a payment in a
certain amount, subject to certain limitations in the number of times each event may be extended.

Penn maintains control of all filing, prosecution and maintenance of the Institutions’ patent rights licensed by us, and we are responsible for all
ongoing patent costs during the term of the agreement. We also reimbursed Penn for its out-of-pocket expenses incurred prior to the effective date of the
agreement with respect to the filing, prosecution and maintenance of the patent rights licensed by us. Under the terms of the License Agreement, we are
also obligated to pay $2.0 million annually for three years beginning August 2018 for funding to the laboratories of each of Drs. Milone and Payne. See “—
Sponsored Research Agreements with the Trustees of the University of Pennsylvania.”

Under the License Agreement, we must use commercially reasonable efforts to develop and commercialize a product in each subfield. During the
term of the License Agreement until the first commercial sale of the first product, we are obligated to pay Penn a non-refundable, non-creditable annual
license  maintenance  fee  of  $10,000.  We  are  required  to  pay  certain  milestone  payments  upon  the  achievement  of  specified  clinical  and  commercial
milestones. Milestone payments are reduced by a certain percentage for the second product that achieves a milestone, by an additional percentage for the
third  product  that  achieves  a  milestone,  and  so  on,  for  each  subsequent  product  that  achieves  a  milestone.  In  the  event  that  we  are  able  to  successfully
develop and launch multiple products under the License Agreement, total milestone payments could approach $20.0 million. Penn is also eligible to receive
tiered royalties at percentage rates in the low single-digits, subject to an annual minimum royalty, on annual worldwide net sales of any products that are
commercialized by us, our affiliates or our sublicensees that contain, use, embody, result from the use of or incorporate, or are covered by, the intellectual
property licensed by us. To the extent we sublicense our license rights under the License Agreement, Penn would be eligible to receive tiered sublicense
income at percentage rates in the mid-single to low double-digits. We have also entered into a subscription and technology transfer agreement with Penn,
pursuant to which we owed Penn an upfront subscription fee, which was paid in 2019, and a nominal non-refundable royalty on the net sales of products, a
portion of which will be credited toward milestone payments and royalties under this License Agreement. Technology transfer activities would be at our
cost and subject to agreement as to the technology to be transferred.

Sponsored Research Agreements with Penn

Dr. Michael Milone

In April 2018, we entered into a Sponsored Research Agreement with Penn for the laboratory of Dr. Milone, or the Milone SRA, pursuant to which
we  agreed  to  sponsor  certain  research  related  to  the  development  of  (i)  T  cell  based  immunotherapies  for  autoimmune  and  alloimmune  antibodies  of
pathologic significance and (ii) a clinical grade microfluidic device designed for single step selection and activation of T cells from blood samples to be
conducted in Dr. Milone’s laboratory at Penn. Under the Milone SRA, Penn granted us a perpetual, irrevocable, non-transferable, non-exclusive license to
use all intellectual property resulting from the research sponsored by us for internal research purposes. In addition, Penn granted us an option to include, in
exchange  for  a  fee,  any  intellectual  property  resulting  from  the  research  sponsored  by  us  that  relates  to  CAAR  T  cell  therapies  for  hemophilia  and/or
pemphigus within the scope of the License Agreement. Penn also granted us an option to negotiate a license to all other intellectual property resulting from
the research sponsored by us. Unless earlier terminated, the Milone SRA will expire on April 23, 2021.

Dr. Aimee Payne

In April 2018, we entered into a Sponsored Research Agreement with Penn for the laboratory of Dr. Payne, or the Payne SRA, pursuant to which
we  agreed  to  sponsor  certain  research  related  to  the  development  of  T  cell  based  immunotherapies  for  autoimmune  and  alloimmune  antibodies  of
pathologic  significance  to  be  conducted  in  Dr.  Payne’s  laboratory  at  Penn.  Under  the  Payne  SRA,  Penn  granted  us  a  perpetual,  irrevocable,  non-
transferable, non-exclusive license to use all intellectual property resulting from the research sponsored by us for internal research purposes. In addition,
Penn granted us an option to include, in exchange for a fee, any intellectual property resulting from the research sponsored by us that relates to CAAR T
cell therapies for hemophilia, MG and/or pemphigus within the scope of the License Agreement. Penn also granted us an option to negotiate a license to all

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other intellectual property resulting from the research sponsored by us. Unless earlier terminated, the Payne SRA will expire on April 23, 2021.

We have committed to funding a defined research plan for three years through April 2021 under both the Milone SRA and Payne SRA. We have

estimated the three-year cost of the two SRAs to be $8.5 million, which satisfies the $2.0 million annual obligation under the License Agreement.

Master Translational Research Services Agreement with Penn

In October 2018, we entered into a Master Translational Research Services Agreement with Penn, or the Services Agreement, pursuant to which
Penn agreed to perform certain services related to the research and development of the technology licensed to us under the License Agreement, as well as
certain clinical, regulatory and manufacturing services. The Services Agreement will expire on the later of (i) October 19, 2021 or (ii) completion of the
services for which we have engaged Penn under the Services Agreement. Either party may terminate this agreement with or without cause upon a certain
number of days’ prior written notice. The services encompassed by the Services Agreement are performed by different organizations at Penn pursuant to
certain addenda to the Services Agreement, including the Center for Advanced Retinal and Ocular Therapeutics, or CAROT, Addendum and the CVPF
Addendum. In addition, in July 2019 we entered into an Alliance Agreement with Penn, pursuant to which we will pay Penn a nominal annual fee in order
for Penn to provide an adequate and consistent level of support to the services that it provides to us.

The CAROT Addendum

Under the CAROT Addendum, Penn manufactures vector that is then to be used by the CVPF in the manufacture of our product candidates. In the
event that certain materials owned by Penn are incorporated into a product developed for us, Penn has agreed to grant us a limited license to use those
materials.  Further,  Penn  agreed  to  grant  us  an  exclusive,  paid-up,  royalty-free,  transferable,  irrevocable,  perpetual  exclusive  license  to  any  deliverables
produced under the CAROT Addendum, except with respect to certain technical information of Penn that is contained or incorporated in the deliverables,
to which Penn agreed to grant us a limited nonexclusive license. However, any necessary technology transfer would be pursuant to the subscription and
technology transfer agreement described above.

The CVPF Addendum

Under  the  CVPF  Addendum,  Penn  conducts  process  validation  studies  and  large-scale  engineering  runs  for  our  product  candidates.  Under  the
CVPF  Addendum,  CVPF  will  contractually  agree  to  manufacture  agreed  upon  quantities  of  DSG3-CAART  material  for  use  in  connection  with  our
DesCAARTesTM Trial, unless the agreement is terminated by either party. Any necessary technology transfer would be pursuant to the subscription and
technology transfer agreement described above.

Research Agreement with The Regents of the University of California

In  October  2018,  we  entered  into  a  Research  Agreement,  or  the  UC  Agreement,  with  The  Regents  of  the  University  of  California,  or  the  UC
Regents,  pursuant  to  which  the  UC  Regents  agreed  to  perform  certain  research  projects  relating  to  the  toxicity  and  activity  of  MuSK  CAAR  T  cells  in
various models of anti-MuSK MG, or the UC Research.

The UC Agreement provides that the UC Regents will own all rights to any intellectual property developed solely by UC Regents employees in
conducting the UC Research, or developed solely by any of our employees that conduct the UC Research using the UC Regents’ facilities or resources. The
UC Regents granted us an irrevocable, royalty-free, nonexclusive, worldwide, nontransferable, perpetual license to use this UC-owned intellectual property
for internal research purposes only.

We  and  the  UC  Regents  jointly  own  the  rights  to  any  intellectual  property  jointly  developed  by  our  employees  and  UC  Regents  employees  in
conducting the UC Research, provided that our employees did not use the UC Regents’ facilities or resources in the research. We were granted an option to
acquire a non-exclusive or exclusive,

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worldwide, transferable license, including the right to sublicense, to make, use sell, offer for sale, import and otherwise exploit products embodying these
joint inventions.

If  we  exercise  our  option  with  respect  to  certain  intellectual  property  under  the  UC  Agreement,  any  license  we  enter  into  will  require  us  to
diligently pursue timely commercial development and marketing of product candidates using such intellectual property, and will be subject to other terms
and  conditions  to  be  negotiated  at  the  time  of  entering  into  any  such  license.  Unless  earlier  terminated,  the  term  of  the  UC  Agreement  will  expire  on
October 1, 2020.

Government Regulation

U.S. Regulation

As a biopharmaceutical company that operates in the United States, we are subject to extensive regulation. Our cell products will be regulated as
biologics. With this classification, commercial production of our products will need to occur in registered facilities in compliance with cGMP for biologics.
The FDA categorizes human cell- or tissue-based products as either minimally manipulated or more than minimally manipulated, and has determined that
more than minimally manipulated products require clinical trials to demonstrate product safety and efficacy and the submission of a BLA for marketing
authorization. Our products are considered more than minimally manipulated and will require evaluation in clinical trials and the submission and approval
of a BLA before we can market them.

Government authorities in the United States (at the federal, state and local level) and in other countries extensively regulate, among other things,
the  research,  development,  testing,  manufacturing,  quality  control,  approval,  labeling,  packaging,  storage,  record-keeping,  promotion,  advertising,
distribution, post-approval monitoring and reporting, marketing and export and import of biopharmaceutical products such as those we are developing. Our
product  candidates  must  be  approved  by  the  FDA  before  they  may  be  legally  marketed  in  the  United  States  and  by  the  appropriate  foreign  regulatory
agency before they may be legally marketed in foreign countries. Generally, our activities in other countries will be subject to regulation that is similar in
nature and scope as that imposed in the United States, although there can be important differences. Additionally, some significant aspects of regulation in
Europe  are  addressed  in  a  centralized  way,  but  country-specific  regulation  remains  essential  in  many  respects.  The  process  for  obtaining  regulatory
marketing approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations require the expenditure of
substantial time and financial resources.

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U.S. Biological Product Development

In the United States, the FDA regulates biologics under the Federal Food, Drug, and Cosmetic Act, or FDCA, and the Public Health Service Act, or
PHSA, and their implementing regulations. Biologics are also subject to other federal, state and local statutes and regulations. The process of obtaining
regulatory approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations require the expenditure of
substantial  time  and  financial  resources.  Failure  to  comply  with  the  applicable  U.S.  requirements  at  any  time  during  the  product  development  process,
approval process or after approval, may result in delays to the conduct of a study, regulatory review and approval or subject an applicant to administrative
or judicial sanctions. These sanctions could include, among other actions, the FDA’s refusal to approve pending applications, withdrawal of an approval,
license suspension or revocation, refusal to allow an applicant to proceed with clinical trials, imposition of a clinical hold, issuance of untitled or warning
letters, product recalls or withdrawals from the market, product seizures, total or partial suspension of production or distribution, injunctions, fines, refusals
of  government  contracts,  restitution,  disgorgement  of  profits,  or  civil  or  criminal  investigations  or  penalties.  Any  agency  or  judicial  enforcement  action
could have a material adverse effect on us.

Our drug product candidates must be approved by the FDA through the Biologics License Application, or BLA, process before they may be legally

marketed in the United States. The process required by the FDA before a biologic may be marketed in the United States generally involves the following:

•

•

•

•

•

•

•

•

completion  of  extensive  nonclinical,  sometimes  referred  to  as  preclinical,  laboratory  tests,  animal  studies  and  formulation  studies  in
accordance with applicable regulations, including the FDA’s Good Laboratory Practice, or GLP, regulations and standards;

submission to the FDA of an IND which must become effective before human clinical trials may begin;

approval by an independent institutional review board, or IRB, representing each clinical site before each clinical trial may be initiated;

performance of adequate and well-controlled human clinical trials in accordance with applicable IND regulations, good clinical practices,
or  GCPs,  and  other  clinical  trial-related  regulations  to  establish  the  safety  and  efficacy  of  the  proposed  drug  product  candidate  for  its
proposed indication;

submission to the FDA of a BLA, which includes not only the results of the clinical trials, but also, detailed information on the chemistry,
manufacture and quality controls for the product candidate and proposed labelling;

satisfactory  completion  of  an  FDA  pre-approval  inspection  of  the  manufacturing  facility  or  facilities  where  the  product  is  produced  to
assess compliance with the FDA’s current good manufacturing practice, or cGMP, requirements to assure that the facilities, methods and
controls are adequate to preserve the product’s identity, strength, quality, purity and potency;

potential FDA audit of the preclinical trial sites and/or clinical trial sites that generated the data in support of the BLA; and

FDA review and approval of the BLA prior to any commercial marketing or sale of the product in the United States.

The data required to support a BLA is generated in two distinct development stages: preclinical and clinical. The preclinical development stage
generally  involves  laboratory  evaluations  of  drug  chemistry,  formulation  and  stability,  as  well  as  studies  to  evaluate  toxicity  in  animals,  which  support
subsequent  clinical  testing.  The  conduct  of  the  preclinical  studies  must  comply  with  federal  regulations,  including  GLPs.  The  sponsor  must  submit  the
results of the preclinical studies, together with manufacturing information, analytical data, any available clinical data or literature and a proposed clinical
protocol, as well as other information, to the FDA as part of the IND. An IND is a request for authorization from the FDA to administer an investigational
drug  product  to  humans.  The  central  focus  of  an  IND  submission  is  on  the  general  investigational  plan  and  the  protocol(s)  for  human  trials.  The  IND
automatically becomes effective 30 days after receipt by the FDA, unless the FDA raises concerns or questions regarding the proposed clinical trials and
places the IND on clinical hold within that 30-day time period. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before
the clinical trial can begin. The FDA may also impose clinical holds on a drug product candidate at any time before or during clinical trials due to safety
concerns, non-compliance, or other issues affecting the integrity of the trial. Accordingly, we cannot be sure that submission of an IND will result in the
FDA allowing clinical trials to begin, or that, once begun, issues will not arise that could cause the trial to be suspended or terminated.

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In addition to the submission of an IND to the FDA before initiation of a clinical trial in the United States, certain human clinical trials involving
recombinant or synthetic nucleic acid molecules had historically been subject to review by the Recombinant DNA Advisory Committee, or RAC, of the
NIH Office of Biotechnology Activities, or the NIH Office of Biotechnology Activities, or OBA, pursuant to the NIH Guideline. On August 17, 2018, the
NIH issued a notice in the Federal Register and issued a public statement proposing changes to the oversight framework for gene therapy trials, including
changes to the applicable NIH Guidelines to modify the roles and responsibilities of the RAC with respect to human clinical trials of gene therapy products,
and requesting public comment on its proposed modifications. During the public comment period, which closed October 16, 2018, the NIH announced that
it will no longer accept new human gene transfer protocols for review as a part of the protocol registration process or convene the RAC to review individual
clinical protocols. In April 2019, NIH announced the updated guidelines, which reflect these proposed changes, and clarify that these trials will remain
subject  to  the  FDA’s  oversight  and  other  clinical  trial  regulations,  and  oversight  at  the  local  level  will  continue  as  set  forth  in  the  NIH  Guidelines.
Specifically,  under  the  NIH  Guidelines,  supervision  of  human  gene  transfer  trials  includes  evaluation  and  assessment  by  an  Institutional  Biosafety
Committee,  or  IBC,  a  local  institutional  committee  that  reviews  and  oversees  research  utilizing  recombinant  or  synthetic  nucleic  acid  molecules  at  that
institution. The IBC assesses the safety of the research and identifies any potential risk to public health or the environment, and such review may result in
some  delay  before  initiation  of  a  clinical  trial.  While  the  NIH  Guidelines  are  not  mandatory  unless  the  research  in  question  is  being  conducted  at  or
sponsored by institutions receiving NIH funding of recombinant or synthetic nucleic acid molecule research, many companies and other institutions not
otherwise subject to the NIH Guidelines voluntarily follow them.

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The  clinical  stage  of  development  involves  the  administration  of  the  drug  product  candidate  to  healthy  volunteers  and  patients  under  the
supervision of qualified investigators, generally physicians not employed by or under the trial sponsor’s control, in accordance with GCPs, which include
the  requirement  that  all  research  subjects  provide  their  informed  consent  for  their  participation  in  any  clinical  trial.  Clinical  trials  are  conducted  under
protocols detailing, among other things, the objectives of the clinical trial, dosing procedures, subject selection and exclusion criteria, and the parameters to
be used to monitor subject safety and assess efficacy. Each protocol, and any subsequent amendments to the protocol, must be submitted to the FDA as part
of  the  IND.  Further,  each  clinical  trial  must  be  reviewed  and  approved  by  an  IRB  at  or  servicing  each  institution  at  which  the  clinical  trial  will  be
conducted.  An  IRB  is  charged  with  protecting  the  welfare  and  rights  of  trial  participants  and  considers  such  items  as  whether  the  risks  to  individuals
participating in the clinical trials are minimized and are reasonable in relation to anticipated benefits. The IRB also approves the informed consent form that
must be provided to each clinical trial subject or his or her legal representative and must monitor the clinical trial until completed.

There are also requirements governing the reporting of ongoing clinical trials and completed clinical trial results to public registries. Sponsors of
certain  clinical  trials  of  FDA-regulated  products,  including  biologics,  are  required  to  register  and  disclose  certain  clinical  trial  information,  which  is
publicly available at www.clinicaltrials.gov.

Clinical trials are generally conducted in three sequential phases, known as Phase 1, Phase 2 and Phase 3, and may overlap. Phase 1 clinical trials
generally involve a small number of healthy volunteers who are initially exposed to a single dose and then multiple doses of the drug product candidate.
The primary purpose of these clinical trials is to assess the metabolism, pharmacologic action tolerability, adverse effects, and safety of the drug product
candidate and, if possible, to gain early evidence on effectiveness. Phase 2 clinical trials typically involve studies in disease-affected patients to determine
the dose required to produce the desired benefits. At the same time, safety and further pharmacokinetic and pharmacodynamic information is collected, as
well  as  identification  of  possible  adverse  effects  and  safety  risks  and  preliminary  evaluation  of  efficacy.  Phase  3  clinical  trials  generally  involve  large
numbers of patients at multiple sites, in multiple countries, and are designed to provide the data necessary to demonstrate the efficacy of the product for its
intended use, its safety in use, and to establish the overall benefit/risk relationship of the product and provide an adequate basis for product approval. Phase
3 clinical trials may include comparisons with placebo and/or other comparator treatments. The duration of treatment is often extended to mimic the actual
use of a product during marketing. Generally, two adequate and well-controlled Phase 3 clinical trials are required by the FDA for approval of a BLA. In
certain instances, FDA may condition approval of a BLA on the sponsor’s agreement to conduct additional clinical trials to further assess the biologic’s
safety  and  effectiveness  after  BLA  approval.  Such  post-approval  trials  are  sometimes  referred  to  as  Phase  4  clinical  trials.  These  trials  are  used  to  gain
additional  experience  from  the  treatment  of  patients  in  the  intended  therapeutic  indication  and  further  document  clinical  benefit  in  the  case  of  drugs
approved  under  Accelerated  Approval  regulations.  Failure  to  exhibit  due  diligence  with  regard  to  conducting  Phase  4  clinical  trials  could  result  in
withdrawal of approval for products.

Progress reports detailing the results of the clinical trials, among other information, must be submitted at least annually to the FDA, and written
IND safety reports must be submitted to the FDA and the investigators for serious and unexpected suspected adverse events, findings from other studies
suggesting a significant risk to humans exposed to the biologic, findings from animal or in vitro testing that suggest a significant risk for human subjects,
and any clinically important increase in the rate of a serious suspected adverse reaction over that listed in the protocol or investigator brochure. Phase 1,
Phase 2 and Phase 3 clinical trials may not be completed successfully within any specified period, if at all. The FDA, the IRB, or the sponsor may suspend
or terminate a clinical trial at any time on various grounds, including a finding that the research subjects or patients are being exposed to an unacceptable
health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance
with the IRB’s requirements or if the drug has been associated with unexpected serious harm to patients. Additionally, some clinical trials are overseen by
an  independent  group  of  qualified  experts  organized  by  the  clinical  trial  sponsor,  known  as  a  data  safety  monitoring  board  or  committee.  This  group
provides authorization for whether or not a trial may move forward at designated intervals based on access to certain data from the trial and may halt the
clinical trial if it determines that there is an unacceptable safety risk for subjects or other grounds, such as interim data suggesting a lack of efficacy. We
may also suspend or terminate a clinical trial based on evolving business objectives and/or competitive climate. Concurrent with clinical trials, companies
usually  complete  additional  animal  studies  and  must  also  develop  additional  information  about  the  chemistry  and  physical  characteristics  of  the  drug
product  candidate  as  well  as  finalize  a  process  for  manufacturing  the  product  in  commercial  quantities  in  accordance  with  cGMP  requirements.  The
manufacturing  process  must  be  capable  of  consistently  producing  quality  batches  of  the  drug  product  candidate  and,  among  other  things,  must  develop
methods for testing the identity, strength, quality, potency and purity of the final product. Additionally,

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appropriate packaging must be selected and tested and stability studies must be conducted to demonstrate that the drug product candidate does not undergo
unacceptable deterioration over its shelf life.

BLA and FDA Review Process

Following  trial  completion,  trial  data  are  analyzed  to  assess  safety  and  efficacy.  The  results  of  preclinical  studies  and  clinical  trials  are  then
submitted to the FDA as part of a BLA, along with proposed labeling for the product and information about the manufacturing process and facilities that
will  be  used  to  ensure  product  quality,  results  of  analytical  testing  conducted  on  the  chemistry  of  the  drug  product  candidate,  and  other  relevant
information.  The  BLA  is  a  request  for  approval  to  market  the  biologic  for  one  or  more  specified  indications  and  must  contain  proof  of  safety,  purity,
potency and efficacy, which is demonstrated by extensive preclinical and clinical testing. The application may include both negative or ambiguous results
of preclinical and clinical trials as well as positive findings. Data may come from company-sponsored clinical trials intended to test the safety and efficacy
of  a  use  of  a  product,  or  from  a  number  of  alternative  sources,  including  studies  initiated  by  investigators.  To  support  marketing  approval,  the  data
submitted must be sufficient in quality and quantity to establish the safety and efficacy of the investigational product to the satisfaction of the FDA. FDA
approval of a BLA must be obtained before a biologic may be marketed in the United States.

Under the Prescription Drug User Fee Act, or PDUFA, as amended, each BLA must be accompanied by a significant user fee, which is adjusted on
an annual basis. PDUFA also imposes an annual prescription drug product program fee. Fee waivers or reductions are available in certain circumstances,
including a waiver of the application fee for the first application filed by a small business.

Once a BLA has been accepted for filing, which occurs, if at all, sixty days after the BLA’s submission, the FDA’s goal is to review BLAs within
10 months of the filing date for standard review or six months of the filing date for priority review, if the application is for a product intended for a serious
or life-threatening condition and the product, if approved, would provide a significant improvement in safety or effectiveness. The FDA has substantial
discretion in the approval process and may refuse to accept any application or decide that the data is insufficient for approval, and may require additional
preclinical,  clinical  or  other  studies  before  it  accepts  the  filing.  Additionally,  the  review  process  is  often  significantly  extended  by  FDA  requests  for
additional information or clarification.

After the BLA submission is accepted for filing, the FDA reviews the BLA to determine, among other things, whether the proposed drug product
candidate is safe and effective for its intended use, and whether the drug product candidate is being manufactured in accordance with cGMP to assure and
preserve the drug product candidate’s identity, strength, quality, purity and potency. The FDA may refer applications for novel drug product candidates or
drug product candidates which present difficult questions of safety or efficacy to an advisory committee, typically a panel that includes clinicians and other
experts, for review, evaluation and a recommendation as to whether the application should be approved and under what conditions. The FDA is not bound
by  the  recommendations  of  an  advisory  committee,  but  it  considers  such  recommendations  carefully  when  making  decisions.  The  FDA  will  likely  re-
analyze the clinical trial data, which could result in extensive discussions between the FDA and us during the review process. The review and evaluation of
a BLA by the FDA is extensive and time consuming and may take longer than originally planned to complete, and we may not receive a timely approval, if
at all.

Before approving a BLA, the FDA will conduct a pre-approval inspection of the manufacturing facilities for the new product to determine whether
the  facilities  comply  with  cGMPs.  The  FDA  will  not  approve  the  product  unless  it  determines  that  the  manufacturing  processes  and  facilities  are  in
compliance  with  cGMP  requirements  and  adequate  to  assure  consistent  production  of  the  product  within  required  specifications.  In  addition,  before
approving a BLA, the FDA may also audit data from clinical trials to ensure compliance with GCP requirements. After the FDA evaluates the application,
manufacturing  process  and  manufacturing  facilities,  it  may  issue  an  approval  letter  or  a  Complete  Response  Letter.  An  approval  letter  authorizes
commercial marketing of the product with specific prescribing information for specific indications. A Complete Response Letter indicates that the review
cycle of the application is complete and the application will not be approved in its present form. A Complete Response Letter usually describes all of the
specific deficiencies in the BLA identified by the FDA. The Complete Response Letter may require additional clinical data and/or an additional pivotal
Phase  3  clinical  trial(s),  and/or  other  significant  and  time-consuming  requirements  related  to  clinical  trials,  preclinical  studies  or  manufacturing.  If  a
Complete  Response  Letter  is  issued,  the  applicant  may  either  resubmit  the  BLA,  addressing  all  of  the  deficiencies  identified  in  the  letter,  withdraw  the
application or request a hearing. Even if such data and information is submitted, the FDA may

37

ultimately decide that the BLA does not satisfy the criteria for approval. Data obtained from clinical trials are not always conclusive, and the FDA may
interpret data differently than we interpret the same data.

There  is  no  assurance  that  the  FDA  will  ultimately  approve  a  product  for  marketing  in  the  United  States,  and  we  may  encounter  significant
difficulties or costs during the review process. If a product receives marketing approval, the approval may be significantly limited to specific populations,
severities of allergies, and dosages or the indications for use may otherwise be limited, which could restrict the commercial value of the product. Further,
the FDA may require that certain contraindications, warnings or precautions be included in the product labeling or may condition the approval of the BLA
on other changes to the proposed labeling, development of adequate controls and specifications, or a commitment to conduct post-market testing or clinical
trials  and  surveillance  to  monitor  the  effects  of  approved  products.  For  example,  the  FDA  may  require  Phase  4  testing  which  involves  clinical  trials
designed  to  further  assess  the  product’s  safety  and  effectiveness  and  may  require  testing  and  surveillance  programs  to  monitor  the  safety  of  approved
products  that  have  been  commercialized.  The  FDA  may  also  place  other  conditions  on  approvals  including  the  requirement  for  a  Risk  Evaluation  and
Mitigation  Strategy,  or  REMS,  to  assure  the  safe  use  of  the  product.  If  the  FDA  concludes  a  REMS  is  needed,  the  sponsor  of  the  BLA  must  submit  a
proposed  REMS.  The  FDA  will  not  approve  the  BLA  without  an  approved  REMS,  if  required.  A  REMS  could  include  medication  guides,  physician
communication plans, or elements to assure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. Any of
these limitations on approval or marketing could restrict the commercial promotion, distribution, prescription or dispensing of products. Product approvals
may  be  withdrawn  for  non-compliance  with  regulatory  standards  or  based  on  the  results  of  post-market  studies  or  surveillance  programs.  Additionally,
post-approval,  many  types  of  changes  to  the  approved  product,  such  as  adding  new  indications,  changing  manufacturing  processes  and  adding  labeling
claims, are subject to further testing requirements and FDA review and approval. Such post-approval requirements can be costly and time-consuming and
can affect the potential market and profitability of the product.

Orphan Designation and Exclusivity

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biological product intended to treat a rare disease or condition,
which is generally a disease or condition that affects fewer than 200,000 individuals in the United States, or more than 200,000 individuals in the United
States and for which there is no reasonable expectation that the cost of developing and making the product available in the United States for this type of
disease or condition will be recovered from sales of the product.

Orphan drug designation must be requested before submitting an NDA or BLA. After the FDA grants orphan drug designation, the identity of the
therapeutic agent and its potential orphan use are disclosed publicly by the FDA. Orphan drug designation does not convey any advantage in or shorten the
duration of the regulatory review and approval process.

If  a  product  that  has  orphan  drug  designation  subsequently  receives  the  first  FDA  approval  for  the  disease  or  condition  for  which  it  has  such
designation, the product is entitled to orphan drug exclusivity, which means that the FDA may not approve any other applications to market the same drug
or biologic for the same indication for seven years from the date of such approval, except in limited circumstances, such as a showing of clinical superiority
to the product with orphan exclusivity on the basis of greater effectiveness or safety or providing a major contribution to patient care or in instances of drug
supply  issues.  Competitors,  however,  may  receive  approval  of  either  a  different  product  for  the  same  indication  or  the  same  product  for  a  different
indication but that could be used off-label in the orphan indication. Orphan drug exclusivity also could block the approval of one of our products for seven
years if a competitor obtains approval before we do for the same product, as defined by the FDA, for the same indication we are seeking approval, or if our
product is determined to be contained within the scope of the competitor’s product for the same indication or disease. If we pursue marketing approval for
an indication broader than the orphan drug designation we have received, we may not be entitled to orphan drug exclusivity. Orphan drug status in the
European Union has similar, but not identical, requirements and benefits.

Expedited Development and Review Programs

The FDA has a Fast Track program that is intended to expedite or facilitate the process for reviewing new drugs and biological products that meet
certain  criteria.  Specifically,  new  drugs  and  biological  products  are  eligible  for  Fast  Track  designation  if  they  are  intended  to  treat  a  serious  or  life-
threatening condition and nonclinical or

38

clinical data demonstrate the potential to address unmet medical needs for the condition. Fast Track designation applies to the combination of the product
and the specific indication for which it is being studied. The sponsor of a new drug or biologic may request the FDA to designate the drug or biologic as a
Fast  Track  product  concurrently  with,  or  at  any  time  after,  submission  of  an  IND,  and  the  FDA  must  determine  if  the  product  qualifies  for  Fast  Track
designation  within  60  days  of  receipt  of  the  sponsor’s  request.  Under  the  Fast  Track  designation,  the  FDA  may  consider  for  review  sections  of  the
marketing application on a rolling basis before the complete application is submitted, if the sponsor provides a schedule for the submission of the sections
of the application, the FDA agrees to accept sections of the application and determines that the schedule is acceptable, and the sponsor pays any required
user fees upon submission of the first section of the application.

Any product submitted to the FDA for marketing, including under a Fast Track program, may be eligible for other types of FDA programs intended
to expedite development and review, such as priority review and accelerated approval. Any product is eligible for priority review, or review within a six-
month  timeframe  from  the  date  a  complete  BLA  is  accepted  for  filing,  if  it  has  the  potential  to  provide  a  significant  improvement  in  safety  and
effectiveness compared to available therapies. The FDA will attempt to direct additional resources to the evaluation of an application for a new drug or
biological product designated for priority review in an effort to facilitate the review.

Additionally, a product may be eligible for accelerated approval. An investigational drug may obtain accelerated approval if it treats a serious or
life-threatening condition and generally provides a meaningful advantage over available therapies and demonstrates an effect on a surrogate endpoint that is
reasonably likely to predict clinical benefit or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, or IMM, that is
reasonably  likely  to  predict  an  effect  on  IMM  or  other  clinical  benefit.  As  a  condition  of  approval,  the  FDA  may  require  that  a  sponsor  of  a  drug  or
biological  product  receiving  accelerated  approval  perform  adequate  and  well-controlled  post-marketing  clinical  trials.  If  the  FDA  concludes  that  a  drug
shown to be effective can be safely used only if distribution or use is restricted, it will require such post-marketing restrictions as it deems necessary to
assure safe use of the drug, such as:

•

•

distribution restricted to certain facilities or physicians with special training or experience; or

distribution conditioned on the performance of specified medical procedures.

The  limitations  imposed  would  be  commensurate  with  the  specific  safety  concerns  presented  by  the  product.  In  addition,  the  FDA  currently
requires as a condition for accelerated approval pre-approval of promotional materials, which could adversely impact the timing of the commercial launch
of the product. Fast Track designation, priority review and accelerated approval do not change the standards for approval but may expedite the development
or approval process.

Breakthrough Designation

A  product  can  be  designated  as  a  breakthrough  therapy  if  it  is  intended  to  treat  a  serious  or  life-threatening  condition  and  preliminary  clinical
evidence indicates that it may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints. A sponsor may
request that a drug product candidate be designated as a breakthrough therapy concurrently with, or at any time after, the submission of an IND, and the
FDA must determine if the drug product candidate qualifies for breakthrough therapy designation within 60 days of receipt of the sponsor’s request. If so
designated,  the  FDA  shall  act  to  expedite  the  development  and  review  of  the  product’s  marketing  application,  including  by  meeting  with  the  sponsor
throughout the product’s development, providing timely advice to the sponsor to ensure that the development program to gather preclinical and clinical data
is as efficient as practicable, involving senior managers and experienced review staff in a cross-disciplinary review, assigning a cross-disciplinary project
lead for the FDA review team to facilitate an efficient review of the development program and to serve as a scientific liaison between the review team and
the sponsor, and taking steps to ensure that the design of the clinical trials is as efficient as practicable.

Accelerated Approval for Regenerative Medicine Advanced Therapies

As  part  of  the  21st  Century  Cures  Act,  Congress  amended  the  FDCA  to  create  an  accelerated  approval  program  for  regenerative  advanced

therapies, which include cell therapies, therapeutic tissue engineering products,

39

 
 
human cell and tissue products, and combination products using any such therapies or products. Regenerative medicine advanced therapies do not include
those human cells, tissues, and cellular and tissue-based products regulated solely under section 361 of the Public Health Service Act and 21 CFR Part
1271.  The  new  program  is  intended  to  facilitate  efficient  development  and  expedite  review  of  regenerative  medicine  advanced  therapies,  which  are
intended to treat, modify, reverse, or cure a serious or life-threatening disease or condition. A drug sponsor may request that FDA designate a drug as a
regenerative medicine advanced therapy concurrently with or at any time after submission of an IND. FDA has 60 calendar days to determine whether the
drug meets the criteria, including whether there is preliminary clinical evidence indicating that the drug has the potential to address unmet medical needs
for a serious or life-threatening disease or condition. A new drug application or BLA for a regenerative medicine advanced therapy may be eligible for
priority review or accelerated approval through (1) surrogate or intermediate endpoints reasonably likely to predict long-term clinical benefit or (2) reliance
upon  data  obtained  from  a  meaningful  number  of  sites.  Benefits  of  such  designation  also  include  early  interactions  with  FDA  to  discuss  any  potential
surrogate  or  intermediate  endpoint  to  be  used  to  support  accelerated  approval.  A  regenerative  medicine  advanced  therapy  that  is  granted  accelerated
approval and is subject to post approval requirements may fulfill such requirements through the submission of clinical evidence, clinical studies, patient
registries,  or  other  sources  of  real  world  evidence,  such  as  electronic  health  records;  the  collection  of  larger  confirmatory  data  sets;  or  post  approval
monitoring of all patients treated with such therapy prior to its approval.

Pediatric Trials

Under  the  Pediatric  Research  Equity  Act,  or  PREA,  a  BLA  or  supplement  to  a  BLA  must  contain  data  to  assess  the  safety  and  efficacy  of  the
product for the claimed indications in all relevant pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for
which  the  product  is  safe  and  effective.  The  FDCA  requires  that  a  sponsor  who  is  planning  to  submit  a  marketing  application  for  a  drug  or  biological
product  that  includes  a  new  active  ingredient,  new  indication,  new  dosage  form,  new  dosing  regimen  or  new  route  of  administration  submit  an  initial
Pediatric Study Plan, or PSP, within sixty days of an end-of-Phase 2 meeting or as may be agreed between the sponsor and FDA. The initial PSP must
include an outline of the pediatric study or studies that the sponsor plans to conduct, including study objectives and design, age groups, relevant endpoints
and statistical approach, or a justification for not including such detailed information, and any request for a deferral of pediatric assessments or a full or
partial waiver of the requirement to provide data from pediatric studies along with supporting information. The FDA and the sponsor must reach agreement
on the PSP. A sponsor can submit amendments to an agreed-upon initial PSP at any time if changes to the pediatric plan need to be considered based on
data collected from nonclinical studies, early phase clinical trials, and/or other clinical development programs. The FDA may, on its own initiative or at the
request of the applicant, grant deferrals for submission of data or full or partial waivers.

Post-Marketing Requirements

Following approval of a new product, a manufacturer and the approved product are subject to continuing regulation by the FDA, including, among
other things, monitoring and recordkeeping activities, reporting to the applicable regulatory authorities of adverse experiences with the product, providing
the regulatory authorities with updated safety and efficacy information, product sampling and distribution requirements, and complying with promotion and
advertising  requirements,  which  include,  among  others,  standards  for  direct-to-consumer  advertising,  restrictions  on  promoting  products  for  uses  or  in
patient populations that are not described in the product’s approved labeling (known as “off-label use”), limitations on industry-sponsored scientific and
educational activities, and requirements for promotional activities involving the internet. Although physicians may prescribe legally available drugs and
biologics for off-label uses, manufacturers may not market or promote such off-label uses.

Modifications or enhancements to the product or its labeling or changes of the site of manufacture are often subject to the approval of the FDA and
other regulators, which may or may not be received or may result in a lengthy review process. Prescription drug promotional materials must be submitted
to the FDA in conjunction with their first use.

In the United States, once a product is approved, its manufacture is subject to comprehensive and continuing regulation by the FDA. The FDA
regulations require that products be manufactured in specific approved facilities and in accordance with cGMPs. We rely, and expect to continue to rely, on
third parties for the production of clinical and commercial quantities of our products in accordance with cGMP regulations. cGMP regulations require,

40

among other things, quality control and quality assurance as well as the corresponding maintenance of records and documentation and the obligation to
investigate and correct any deviations from cGMP. Manufacturers and other entities involved in the manufacture and distribution of approved products are
required  to  register  their  establishments  with  the  FDA  and  certain  state  agencies,  and  are  subject  to  periodic  unannounced  inspections  by  the  FDA  and
certain state agencies for compliance with cGMP and other laws. Accordingly, manufacturers must continue to expend time, money, and effort in the area
of  production  and  quality  control  to  maintain  cGMP  compliance.  These  regulations  also  impose  certain  organizational,  procedural  and  documentation
requirements  with  respect  to  manufacturing  and  quality  assurance  activities.  BLA  holders  using  contract  manufacturers,  laboratories  or  packagers  are
responsible for the selection and monitoring of qualified firms, and, in certain circumstances, qualified suppliers to these firms. These firms and, where
applicable,  their  suppliers  are  subject  to  inspections  by  the  FDA  at  any  time,  and  the  discovery  of  violative  conditions,  including  failure  to  conform  to
cGMP, could result in enforcement actions that interrupt the operation of any such facilities or the ability to distribute products manufactured, processed or
tested by them. Discovery of problems with a product after approval may result in restrictions on a product, manufacturer, or holder of an approved BLA,
including, among other things, recall or withdrawal of the product from the market.

The FDA also may require post-approval testing, sometimes referred to as Phase 4 testing, REMS and post-marketing surveillance to monitor the
effects  of  an  approved  product  or  place  conditions  on  an  approval  that  could  restrict  the  distribution  or  use  of  the  product.  Discovery  of  previously
unknown problems with a product or the failure to comply with applicable FDA requirements can have negative consequences, including adverse publicity,
judicial  or  administrative  enforcement,  untitled  or  warning  letters  from  the  FDA,  mandated  corrective  advertising  or  communications  with  doctors,  and
civil or criminal penalties, among others. Newly discovered or developed safety or effectiveness data may require changes to a product’s approved labeling,
including the addition of new warnings and contraindications, and also may require the implementation of other risk management measures. Also, new
government  requirements,  including  those  resulting  from  new  legislation,  may  be  established,  or  the  FDA’s  policies  may  change,  which  could  delay  or
prevent regulatory approval of our products under development.

Other Regulatory Matters

Manufacturing, sales, promotion and other activities following product approval are also subject to regulation by numerous regulatory authorities in
addition to the FDA, including, in the United States, the Centers for Medicare & Medicaid Services, or CMS, other divisions of the Department of Health
and  Human  Services  (e.g.,  the  Office  of  Inspector  General,  or  OIG,  and  Office  for  Civil  Rights),  the  Drug  Enforcement  Administration,  the  Consumer
Product Safety Commission, the Federal Trade Commission, the Occupational Safety & Health Administration, the Environmental Protection Agency and
state and local governments. In the United States, sales, marketing and scientific/educational programs must also comply with federal and state fraud and
abuse  laws,  data  privacy  and  security  laws,  transparency  laws,  and  pricing  and  reimbursement  requirements  in  connection  with  governmental  payor
programs,  among  others.  The  handling  of  any  controlled  substances  must  comply  with  the  U.S.  Controlled  Substances  Act  and  Controlled  Substances
Import  and  Export  Act.  Products  must  meet  applicable  child-resistant  packaging  requirements  under  the  U.S.  Poison  Prevention  Packaging  Act.
Manufacturing, sales, promotion and other activities are also potentially subject to federal and state consumer protection and unfair competition laws.

The distribution of pharmaceutical products is subject to additional requirements and regulations, including extensive record-keeping, licensing,

storage and security requirements intended to prevent the unauthorized sale of pharmaceutical products.

The failure to comply with regulatory requirements subjects firms to possible legal or regulatory action. Depending on the circumstances, failure to
meet applicable regulatory requirements can result in criminal prosecution, fines or other penalties, injunctions, recall or seizure of products, total or partial
suspension  of  production,  denial  or  withdrawal  of  product  approvals,  or  refusal  to  allow  a  firm  to  enter  into  supply  contracts,  including  government
contracts. In addition, even if a firm complies with FDA and other requirements, new information regarding the safety or efficacy of a product could lead
the FDA to modify or withdraw product approval. Prohibitions or restrictions on sales or withdrawal of future products marketed by us could materially
affect our business in an adverse way.

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Changes  in  regulations,  statutes  or  the  interpretation  of  existing  regulations  could  impact  our  business  in  the  future  by  requiring,  for  example:
(i)  changes  to  our  manufacturing  arrangements;  (ii)  additions  or  modifications  to  product  labeling;  (iii)  the  recall  or  discontinuation  of  our  products;  or
(iv) additional record-keeping requirements. If any such changes were to be imposed, they could adversely affect the operation of our business.

U.S. Patent Term Restoration and Marketing Exclusivity

Depending upon the timing, duration and specifics of the FDA approval of our drug product candidates, some of our U.S. patents may be eligible
for limited patent term extension under the Drug Price Competition and Patent Term Restoration Act of 1984, commonly referred to as the Hatch-Waxman
Amendments. The Hatch-Waxman Amendments permit a patent restoration term of up to five years as compensation for patent term lost during product
development and the FDA regulatory review process. However, patent term restoration cannot extend the remaining term of a patent beyond a total of 14
years  from  the  product’s  approval  date.  The  patent  term  restoration  period  is  generally  one-half  the  time  between  the  effective  date  of  an  IND  and  the
submission  date  of  a  BLA  plus  the  time  between  the  submission  date  of  a  BLA  and  the  approval  of  that  application,  except  that  the  review  period  is
reduced by any time during which the applicant failed to exercise due diligence. Only one patent applicable to an approved drug is eligible for the extension
and the application for the extension must be submitted prior to the expiration of the patent. The U.S. PTO, in consultation with the FDA, reviews and
approves the application for any patent term extension or restoration. In the future, we may apply for restoration of patent term for our currently owned or
licensed patents to add patent life beyond its current expiration date, depending on the expected length of the clinical trials and other factors involved in the
filing of the relevant BLA.

An abbreviated approval pathway for biological products shown to be biosimilar to, or interchangeable with, an FDA-licensed reference biological
product was created by the Biologics Price Competition and Innovation Act of 2009, or BPCI Act, which was part of the Patient Protection and Affordable
Care Act, as amended by the Health Care and Education Reconciliation Act of 2010, or collectively the ACA. This amendment to the PHSA attempts to
minimize  duplicative  testing.  Biosimilarity,  which  requires  that  the  biological  product  be  highly  similar  to  the  reference  product  notwithstanding  minor
differences in clinically inactive components and that there be no clinically meaningful differences between the product and the reference product in terms
of  safety,  purity,  and  potency,  can  be  shown  through  analytical  studies,  animal  studies,  and  a  clinical  trial  or  trials.  Interchangeability  requires  that  a
biological product be biosimilar to the reference product and that the product can be expected to produce the same clinical results as the reference product
in  any  given  patient  and,  for  products  administered  multiple  times,  that  the  product  and  the  reference  product  may  be  switched  after  one  has  been
previously  administered  without  increasing  safety  risks  or  risks  of  diminished  efficacy  relative  to  exclusive  use  of  the  reference  biological  product.
However, complexities associated with the larger, and often more complex, structure of biological products as compared to small molecule drugs, as well as
the processes by which such products are manufactured, pose significant hurdles to implementation that are still being worked out by the FDA.

A reference biological product is granted twelve years of exclusivity from the time of first licensure of the product, and the FDA will not accept an
application  for  a  biosimilar  or  interchangeable  product  based  on  the  reference  biological  product  until  four  years  after  first  licensure.  “First  licensure”
typically  means  the  initial  date  the  particular  product  at  issue  was  licensed  in  the  United  States.  This  does  not  include  a  supplement  for  the  biological
product or a subsequent application by the same sponsor or manufacturer of the biological product (or licensor, predecessor in interest, or other related
entity) for a change that results in a new indication, route of administration, dosing schedule, dosage form, delivery system, delivery device, or strength,
unless  that  change  is  a  modification  to  the  structure  of  the  biological  product  and  such  modification  changes  its  safety,  purity,  or  potency.  Whether  a
subsequent application, if approved, warrants exclusivity as the “first licensure” of a biological product is determined on a case-by-case basis with data
submitted by the sponsor.

Pediatric  exclusivity  is  another  type  of  regulatory  market  exclusivity  in  the  United  States.  Pediatric  exclusivity,  if  granted,  adds  six  months  to
existing exclusivity periods and patent terms. This six-month exclusivity, which attaches to the twelve-year exclusivity period for reference biologics, may
be granted based on the voluntary completion of a pediatric trial in accordance with an FDA-issued “Written Request” for such a trial.

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Pricing and Reimbursement

United States

Sales  of  our  products  will  depend,  in  part,  on  the  extent  to  which  our  products,  once  approved,  will  be  covered  and  reimbursed  by  third-party
payors,  such  as  government  health  programs,  commercial  insurance  and  managed  healthcare  organizations.  These  third-party  payors  are  increasingly
reducing  reimbursements  for  medical  products  and  services.  The  process  for  determining  whether  a  third-party  payor  will  provide  coverage  for  a  drug
product, including a biologic, typically is separate from the process for setting the price of a drug product or for establishing the reimbursement rate that a
payor will pay for the drug product once coverage is approved. Third-party payors may limit coverage to specific drug products on an approved list, also
known as a formulary, which might not include all of the approved drugs for a particular indication.

In order to secure coverage and reimbursement for any drug product candidate that might be approved for sale, we may need to conduct expensive
pharmacoeconomic  studies  in  order  to  demonstrate  the  medical  necessity  and  cost-effectiveness  of  the  drug  product  candidate,  in  addition  to  the  costs
required  to  obtain  FDA  or  other  comparable  regulatory  approvals.  Whether  or  not  we  conduct  such  studies,  our  drug  product  candidates  may  not  be
considered medically necessary or cost-effective. A third-party payor’s decision to provide coverage for a drug product does not imply that an adequate
reimbursement  rate  will  be  approved.  Third  party  reimbursement  may  not  be  sufficient  to  enable  us  to  maintain  price  levels  high  enough  to  realize  an
appropriate return on our investment in product development. In the United States, the principal decisions about reimbursement for new drug products are
typically made by the U.S. Centers for Medicare and Medicaid Services, or CMS, an agency within the U.S. Department of Health and Human Services, or
HHS. CMS decides whether and to what extent a new drug product will be covered and reimbursed under Medicare, and private payors tend to follow
CMS to a substantial degree. However, no uniform policy of coverage and reimbursement for drug products exists among third-party payors and coverage
and reimbursement levels for drug products can differ significantly from payor to payor. Additionally, one third-party payor’s decision to cover a particular
product or service does not ensure that other payors will also provide coverage for the product or service, and the level of coverage and reimbursement can
differ significantly from payor to payor. As a result, the coverage determination process will often require us to provide scientific and clinical support for
the use of our products to each payor separately and can be a time-consuming process, with no assurance that coverage and adequate reimbursement will be
applied consistently or obtained in the first instance.

The containment of healthcare costs has become a priority of federal and state governments, and the prices of drugs, including biologics, have been
a focus in this effort. The U.S. government, state legislatures and foreign governments have shown significant interest in implementing cost-containment
programs, including price controls, restrictions on reimbursement and requirements for substitution of generic products. In many countries, the prices of
drug products are subject to varying price control mechanisms as part of national health systems. In general, the prices of drug products under such systems
are  substantially  lower  than  in  the  United  States.  Other  countries  allow  companies  to  fix  their  own  prices  for  drug  products,  but  monitor  and  control
company profits. Accordingly, in markets outside the United States, the reimbursement for drug products may be reduced compared with the United States.
Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures,
could further limit our net revenue and results. Decreases in third-party reimbursement for our drug product candidate or a decision by a third-party payor
to not cover our drug product candidate could reduce physician usage of the drug product candidate and have a material adverse effect on our sales, results
of operations and financial condition.

Outside  of  the  United  States,  the  pricing  of  pharmaceutical  products  is  subject  to  governmental  control  in  many  countries.  For  example,  in  the
European Union, pricing and reimbursement schemes vary widely from country to country. Some countries provide that products may be marketed only
after a reimbursement price has been approved. Some countries may require the completion of additional studies that compare the cost effectiveness of a
particular therapy to currently available therapies or so-called health technology assessments, in order to obtain reimbursement or pricing approval. Other
countries may allow companies to fix their own prices for products, but monitor and control product volumes and issue guidance to physicians to limit
prescriptions.  Efforts  to  control  prices  and  utilization  of  pharmaceutical  products  will  likely  continue  as  countries  attempt  to  manage  healthcare
expenditures.

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Other Healthcare Laws and Compliance Requirements

Healthcare providers, physicians, and third-party payors will play a primary role in the recommendation and prescription of any products for which
we obtain marketing approval. Our business operations in the United States and our current and future arrangements with clinical investigators, healthcare
providers, consultants, third-party payors and patients may expose us to broadly applicable federal and state fraud and abuse and other healthcare laws and
regulations that may constrain the business or financial arrangements and relationships through which we market, sell and distribute any drugs for which
we obtain marketing approval. In the United States, these laws include: the federal Anti-Kickback Statute, the False Claims Act, and HIPAA.

The  Anti-Kickback  Statute  makes  it  illegal  for  any  person,  including  a  prescription  drug  manufacturer  (or  a  party  acting  on  its  behalf),  to
knowingly  and  willfully  solicit,  receive,  offer  or  pay  any  remuneration,  directly  or  indirectly,  in  cash  or  in  kind,  that  is  intended  to  induce  or  reward
referrals, including the purchase, recommendation, order or prescription of a particular drug, for which payment may be made under a federal healthcare
program, such as Medicare or Medicaid. Violations of this law are punishable by imprisonment, criminal fines, administrative civil money penalties and
exclusion from participation in federal healthcare programs. In addition, a person or entity does not need to have actual knowledge of the statute or specific
intent to violate it. Moreover, the ACA provides that the government may assert that a claim including items or services resulting from a violation of the
federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the federal civil False Claims Act.

Although we would not submit claims directly to payors, drug manufacturers can be held liable under the federal civil False Claims Act, which
imposes civil penalties, including through civil whistleblower or qui tam actions, against individuals or entities (including manufacturers) for, among other
things, knowingly presenting, or causing to be presented to federal programs (including Medicare and Medicaid) claims for items or services, including
drugs, that are false or fraudulent, claims for items or services not provided as claimed, or claims for medically unnecessary items or services. Penalties for
a False Claims Act violation include three times the actual damages sustained by the government, plus mandatory civil penalties for each separate false
claim, the potential for exclusion from participation in federal healthcare programs and, although the federal False Claims Act is a civil statute, conduct that
results in a False Claims Act violation may also implicate various federal criminal statutes. The government may deem manufacturers to have “caused” the
submission of false or fraudulent claims by, for example, providing inaccurate billing or coding information to customers or promoting a product off- label.
Claims which include items or services resulting from a violation of the federal Anti-Kickback Statute are false or fraudulent claims for purposes of the
False Claims Act. Our future marketing and activities relating to the reporting of wholesaler or estimated retail prices for our products, if approved, the
reporting  of  prices  used  to  calculate  Medicaid  rebate  information  and  other  information  affecting  federal,  state  and  third-party  reimbursement  for  our
products, and the sale and marketing of our product candidates, are subject to scrutiny under this law.

HIPAA  created  new  federal  criminal  statutes  that  prohibit  among  other  things,  knowingly  and  willfully  executing,  or  attempting  to  execute,  a
scheme  to  defraud  or  to  obtain,  by  means  of  false  or  fraudulent  pretenses,  representations  or  promises,  any  money  or  property  owned  by,  or  under  the
control  or  custody  of,  any  healthcare  benefit  program,  including  private  third  party  payors,  knowingly  and  willfully  embezzling  or  stealing  from  a
healthcare  benefit  program,  willfully  obstructing  a  criminal  investigation  of  a  healthcare  offense,  and  knowingly  and  willfully  falsifying,  concealing  or
covering up by trick, scheme or device, a material fact or making any materially false, fictitious or fraudulent statement in connection with the delivery of
or payment for healthcare benefits, items or services. Like the federal Anti-Kickback Statute a person or entity does not need to have actual knowledge of
the statute or specific intent to violate it in order to have committed a violation.

The civil monetary penalties statute imposes penalties against any person or entity that, among other things, is determined to have presented or
caused to be presented a claim to a federal health program that the person knows or should know is for an item or service that was not provided as claimed
or is false or fraudulent.

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We  may  be  subject  to  data  privacy  and  security  regulations  by  both  the  federal  government  and  the  states  in  which  we  conduct  our  business.
HIPAA, as amended by HITECH, and their implementing regulations, mandates, among other things, the adoption of uniform standards for the electronic
exchange  of  information  in  common  healthcare  transactions,  as  well  as  standards  relating  to  the  privacy  and  security  of  individually  identifiable  health
information, which require the adoption of administrative, physical and technical safeguards to protect such information. Among other things, HITECH
makes HIPAA’s security standards directly applicable to business associates, defined as independent contractors or agents of covered entities, which include
certain  health  care  providers,  health  plans,  and  healthcare  clearinghouses,  that  create,  receive  or  obtain  protected  health  information  in  connection  with
providing  a  service  for  or  on  behalf  of  a  covered  entity.  HITECH  also  increased  the  civil  and  criminal  penalties  that  may  be  imposed  against  covered
entities and business associates, and gave state attorneys general new authority to file civil actions for damages or injunctions in federal courts to enforce
the federal HIPAA laws and seek attorney’s fees and costs associated with pursuing federal civil actions. In addition, certain state laws govern the privacy
and security of health information in certain circumstances, some of which are more stringent than HIPAA and many of which differ from each other in
significant ways and may not have the same effect, thus complicating compliance efforts. Failure to comply with these laws, where applicable, can result in
the imposition of significant civil and criminal penalties.

Additionally, the federal Physician Payments Sunshine Act, or the Sunshine Act, within the ACA, and its implementing regulations, require that
certain manufacturers of drugs, devices, biological and medical supplies for which payment is available under Medicare, Medicaid or the Children’s Health
Insurance Program (with certain exceptions) report annually to CMS information related to certain payments or other transfers of value made or distributed
to  physicians  and  teaching  hospitals,  or  to  entities  or  individuals  at  the  request  of,  or  designated  on  behalf  of,  physicians,  certain  other  healthcare
professionals,  and  teaching  hospitals  and  to  report  annually  certain  ownership  and  investment  interests  held  by  physicians,  certain  other  healthcare
professionals, and their immediate family members. Effective January 1, 2022, these reporting obligations will extend to include transfers of value made to
certain non-physician providers such as physician assistants and nurse practitioners. In addition, many states also govern the reporting of payments or other
transfers of value, many of which differ from each other in significant ways, are often not pre-empted, and may have a more prohibitive effect than the
Sunshine Act, thus further complicating compliance efforts.

Similar federal, state and foreign fraud and abuse laws and regulations, such as state anti-kickback and false claims laws, may apply to sales or
marketing arrangements and claims involving healthcare items or services. Such laws are generally broad and are enforced by various state agencies and
private actions. Also, many states have similar fraud and abuse statutes or regulations that may be broader in scope and may apply regardless of payor, in
addition to items and services reimbursed under Medicaid and other state programs. Some state laws require pharmaceutical companies to comply with the
pharmaceutical industry’s voluntary compliance guidelines and the relevant federal government compliance guidance, and require drug manufacturers to
report information related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures.

In  order  to  distribute  products  commercially,  we  must  comply  with  state  laws  that  require  the  registration  of  manufacturers  and  wholesale
distributors of drug and biological products in a state, including, in certain states, manufacturers and distributors who ship products into the state even if
such manufacturers or distributors have no place of business within the state. Some states also impose requirements on manufacturers and distributors to
establish the pedigree of product in the chain of distribution, including some states that require manufacturers and others to adopt new technology capable
of  tracking  and  tracing  product  as  it  moves  through  the  distribution  chain.  Several  states  have  enacted  legislation  requiring  pharmaceutical  and
biotechnology  companies  to  establish  marketing  compliance  programs,  file  periodic  reports  with  the  state,  make  periodic  public  disclosures  on  sales,
marketing,  pricing,  clinical  trials  and  other  activities,  and/or  register  their  sales  representatives,  as  well  as  to  prohibit  pharmacies  and  other  healthcare
entities from providing certain physician prescribing data to pharmaceutical and biotechnology companies for use in sales and marketing, and to prohibit
certain other sales and marketing practices. All of our activities are potentially subject to federal and state consumer protection and unfair competition laws.

45

The  scope  and  enforcement  of  each  of  these  laws  is  uncertain  and  subject  to  rapid  change  in  the  current  environment  of  healthcare  reform,
especially  in  light  of  the  lack  of  applicable  precedent  and  regulations.  Federal  and  state  enforcement  bodies  have  recently  increased  their  scrutiny  of
interactions between healthcare companies and healthcare providers, which has led to a number of investigations, prosecutions, convictions and settlements
in  the  healthcare  industry.  It  is  possible  that  governmental  authorities  will  conclude  that  our  business  practices  may  not  comply  with  current  or  future
statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation
of  any  of  these  laws  or  any  other  governmental  regulations  that  may  apply  to  us,  we  may  be  subject  to  significant  civil,  criminal  and  administrative
penalties,  damages,  fines,  disgorgement,  contractual  damages,  reputational  harm,  diminished  profits  and  future  earnings,  individual  imprisonment,
exclusion of drugs from government funded healthcare programs, such as Medicare and Medicaid, and the curtailment or restructuring of our operations,
any of which could adversely affect our ability to operate our business and our financial results. If any of the physicians or other healthcare providers or
entities with whom we expect to do business is found to be not in compliance with applicable laws, they may be subject to criminal, civil or administrative
sanctions, including exclusions from government funded healthcare programs. Ensuring business arrangements comply with applicable healthcare laws, as
well as responding to possible investigations by government authorities, can be time- and resource- consuming and can divert a company’s attention from
the business.

Current and Future Legislation

In the United States and some foreign jurisdictions, there have been, and likely will continue to be, a number of legislative and regulatory changes
and  proposed  changes  regarding  the  healthcare  system  directed  at  broadening  the  availability  of  healthcare,  improving  the  quality  of  healthcare,  and
containing or lowering the cost of healthcare.

For  example,  in  March  2010,  the  ACA  was  enacted  in  the  United  States.  The  ACA  includes  measures  that  have  significantly  changed,  and  are
expected to continue to significantly change, the way healthcare is financed by both governmental and private insurers. Among the provisions of the ACA
of greatest importance to the pharmaceutical industry are that the ACA:

1.

2.

3.

4.

5.

6.

7.

made several changes to the Medicaid Drug Rebate Program, including increasing pharmaceutical manufacturers’ rebate liability by raising
the minimum basic Medicaid rebate on average manufacturer price, or AMP, on most branded prescription drugs and adding a new rebate
calculation  for  “line  extensions”  (i.e.,  new  formulations,  such  as  extended  release  formulations)  of  solid  oral  dosage  forms  of  branded
products, as well as potentially impacting their rebate liability by modifying the statutory definition of AMP;

imposed  a  requirement  on  manufacturers  of  branded  drugs  to  provide  a  50%  point-of-sale  discount  (increased  to  70%  pursuant  to  the
Bipartisan Budget Act of 2018, effective as of January 1, 2019) off the negotiated price of branded drugs dispensed to Medicare Part D
beneficiaries in the coverage gap (i.e., “donut hole”) as a condition for a manufacturer’s outpatient drugs being covered under Medicare
Part D;

extended a manufacturer’s Medicaid rebate liability to covered drugs dispensed to individuals who are enrolled in Medicaid managed care
organizations;

expanded the entities eligible for discounts under the 340B Drug Discount Program;

established a new methodology by which rebates owed by manufacturers under the Medicaid Drug Rebate Program are calculated for drugs
that are inhaled, infused, instilled, implanted, or injected;

imposed an annual, nondeductible fee on any entity that manufactures or imports certain branded prescription drugs, apportioned among
these entities according to their market share in certain government healthcare programs, and

established  a  new  Patient-Centered  Outcomes  Research  Institute  to  oversee,  identify  priorities  in,  and  conduct  comparative  clinical
effectiveness research, along with funding for such research. The research conducted by the Patient-Centered Outcomes Research Institute
may affect the market for certain pharmaceutical products. The ACA established the Center for Medicare and Medicaid Innovation within
CMS to test innovative payment and service delivery models to lower Medicare and Medicaid spending,

46

 
 
 
 
 
 
 
potentially  including  prescription  drug  spending.  Funding  has  been  allocated  to  support  the  mission  of  the  Center  for  Medicare  and
Medicaid Innovation through 2019.

Various portions of the ACA are currently undergoing constitutional challenges in the Fifth Circuit Court and the United States Supreme Court.
The Trump Administration has issued various Executive Orders eliminating cost sharing subsidies and various provisions that would impose a fiscal burden
on  states  or  a  cost,  fee,  tax,  penalty  or  regulatory  burden  on  individuals,  healthcare  providers,  health  insurers,  or  manufacturers  of  pharmaceuticals  or
medical devices, and Congress has introduced several pieces of legislation aimed at significantly revising or repealing the ACA. It is unclear whether the
ACA  will  be  overturned,  repealed,  replaced,  or  further  amended,  and  we  cannot  predict  what  affect  further  changes  to  the  ACA  would  have  on  our
business.

Moreover,  in  May  2018,  the  Trump  administration  released  its  “Blueprint  to  Lower  Drug  Prices  and  Reduce  Out-of-Pocket  Costs,”  or  the
Blueprint.  The  Blueprint  contains  several  potential  regulatory  actions  and  legislative  recommendations  aimed  at  lowering  prescription  drug  prices,
including measures to promote innovation and competition for biologics, changes to Medicare Part D to give plan sponsors more leverage when negotiating
prices  with  manufacturers,  and  updating  the  Medicare  drug-pricing  dashboard  to  make  price  increases  and  generic  competition  more  transparent.  In
addition, HHS released a Request for Information, or RFI, soliciting public input on ways to lower drug pricing. Together, the recommendations in the
Blueprint and RFI, if enacted by Congress and HHS, could lead to changes to Medicare Parts B and D, including the transition of certain drugs covered
under Part B to Part D or the offering of alternative purchasing options under the Competitive Acquisition Program that currently applies to selected drugs
and biologics covered under Part B. In May 2019, CMS issued a final rule to allow Medicare Advantage Plans the option of using step therapy, a type of
prior authorization, for Part B drugs beginning January 1, 2020. This final rule codified CMS’s policy change that was effective January 1, 2019. While
most of the proposed measures will require authorization through additional legislation to become effective, Congress and the Trump administration have
each indicated that it will continue to seek new legislative, administrative and/or additional measures to control drug costs.

Other legislative changes have been proposed and adopted in the United States since the ACA was enacted. In August 2011, the Budget Control
Act  of  2011,  among  other  things,  created  measures  for  spending  reductions  by  Congress.  A  Joint  Select  Committee  on  Deficit  Reduction,  tasked  with
recommending a targeted deficit reduction of at least $1.2 trillion for the years 2013 through 2021, was unable to reach required goals, thereby triggering
the legislation’s automatic reduction to several government programs. This includes aggregate reductions of Medicare payments to providers up to 2% per
fiscal year, which went into effect in April 2013, following passage of the Bipartisan Budget Act of 2013, and will remain in effect through 2029 unless
additional congressional action is taken. Further, in January 2013, President Obama signed into law the American Taxpayer Relief Act of 2012, which,
among  other  things,  further  reduced  Medicare  payments  to  several  providers,  including  hospitals,  imaging  centers  and  cancer  treatment  centers,  and
increased  the  statute  of  limitations  period  for  the  government  to  recover  overpayments  to  providers  from  three  to  five  years.  Any  reduction  in
reimbursement  from  Medicare  or  other  government  programs  may  result  in  a  similar  reduction  in  payments  from  private  payors,  which  may  adversely
affect our future profitability. Additionally, there has been increasing legislative and enforcement interest in the United States with respect to specialty drug
pricing practices.

On May 30, 2018, the Trickett Wendler, Frank Mongiello, Jordan McLinn, and Matthew Bellina Right to Try Act of 2017, or the Right to Try Act,
was signed into law. The law, among other things, provides a federal framework for certain patients to request access to certain investigational new drug
products that have completed a Phase I clinical trial and that are undergoing investigation for FDA approval. There is no obligation for a pharmaceutical
manufacturer to make its drug products available to eligible patients as a result of the Right to Try Act.

We  cannot  predict  what  healthcare  reform  initiatives  may  be  adopted  in  the  future.  Further  federal,  state  and  foreign  legislative  and  regulatory
developments are likely, and we expect ongoing initiatives to increase pressure on drug pricing. Such reforms could have an adverse effect on anticipated
revenues from product candidates and may affect our overall financial condition and ability to develop product candidates.

The Foreign Corrupt Practices Act

The  FCPA  prohibits  any  U.S.  individual  or  business  from  paying,  offering,  or  authorizing  payment  or  offering  of  anything  of  value,  directly  or
indirectly, to any foreign official, political party or candidate for the purpose of influencing any act or decision of the foreign entity in order to assist the
individual or business in obtaining or retaining business. The FCPA also obligates companies whose securities are listed in the United States to comply

47

 
with  accounting  provisions  requiring  the  company  to  maintain  books  and  records  that  accurately  and  fairly  reflect  all  transactions  of  the  corporation,
including international subsidiaries, and to devise and maintain an adequate system of internal accounting controls for international operations.

Additional Regulation

In  addition  to  the  foregoing,  state  and  federal  laws  regarding  environmental  protection  and  hazardous  substances,  including  the  Occupational
Safety  and  Health  Act,  the  Resource  Conservancy  and  Recovery  Act  and  the  Toxic  Substances  Control  Act,  affect  our  business.  These  and  other  laws
govern our use, handling and disposal of various biological, chemical and radioactive substances used in, and wastes generated by, our operations. If our
operations result in contamination of the environment or expose individuals to hazardous substances, we could be liable for damages and governmental
fines. We believe that we are in material compliance with applicable environmental laws and that continued compliance therewith will not have a material
adverse effect on our business. We cannot predict, however, how changes in these laws may affect our future operations.

Europe / Rest of World Government Regulation

In addition to regulations in the United States, we may be subject to a variety of regulations in other jurisdictions that we may in the future select
governing,  among  other  things,  clinical  trials  and  any  commercial  sales  and  distribution  of  our  products.  Whether  or  not  we  obtain  FDA  approval  of  a
product, we would need to obtain the requisite approvals from regulatory authorities in foreign countries prior to the commencement of clinical trials or
marketing of the product in those countries. Certain countries outside of the United States have a similar process that requires the submission of a clinical
trial  application  much  like  the  IND  prior  to  the  commencement  of  human  clinical  trials.  In  the  EU,  for  example,  a  clinical  trial  application  must  be
submitted to each country’s national health authority and an independent ethics committee, much like the FDA and IRB, respectively. Once the clinical trial
application is approved in accordance with a country’s requirements, clinical trial development may proceed. Because biologically sourced raw materials
are subject to unique contamination risks, their use may be restricted in some countries.

The requirements and process governing the conduct of clinical trials, product licensing, pricing and reimbursement vary from country to country.
In all cases, the clinical trials must be conducted in accordance with GCP and the applicable regulatory requirements and the ethical principles that have
their origin in the Declaration of Helsinki.

To  obtain  regulatory  approval  of  an  investigational  drug  or  biological  product  under  EU  regulatory  systems,  we  must  submit  an  MAA.  The
application  used  to  file  the  BLA  in  the  United  States  is  similar  to  that  required  in  the  EU,  with  the  exception  of,  among  other  things,  country-specific
document requirements.

For  other  countries  outside  of  the  EU,  such  as  countries  in  Eastern  Europe,  Latin  America  or  Asia,  the  requirements  governing  the  conduct  of
clinical  trials,  product  licensing,  pricing  and  reimbursement  vary  from  country  to  country.  In  all  cases,  again,  the  clinical  trials  must  be  conducted  in
accordance with GCP and the applicable regulatory requirements and the ethical principles that have their origin in the Declaration of Helsinki.

If we or our potential collaborators fail to comply with applicable foreign regulatory requirements, we may be subject to, among other things, fines,

suspension or withdrawal of regulatory approvals, product recalls, seizure of products, operating restrictions and criminal prosecution.

European Union General Data Protection Regulation

In  addition  to  EU  regulations  related  to  the  approval  and  commercialization  of  our  products,  we  may  be  subject  to  the  EU’s  General  Data
Protection  Regulation,  or  GDPR.  The  GDPR  imposes  stringent  requirements  for  controllers  and  processors  of  personal  data  of  persons  in  the  EU,
including,  for  example,  more  robust  disclosures  to  individuals  and  a  strengthened  individual  data  rights  regime,  shortened  timelines  for  data  breach
notifications, limitations on retention of information, increased requirements pertaining to special categories of data, such as health data, and additional
obligations when we contract with third-party processors in connection with the processing of the personal data. The GDPR also imposes strict rules on the
transfer of personal data out of the European Union to the United States and other third countries. In addition, the GDPR provides that EU member states
may make their own further laws and regulations limiting the processing of personal data, including genetic, biometric or health data.

48

The GDPR applies extraterritorially, and we may be subject to the GDPR because of our data processing activities that involve the personal data of
individuals located in the European Union, such as in connection with our EU clinical trials. Failure to comply with the requirements of the GDPR and the
applicable  national  data  protection  laws  of  the  EU  member  states  may  result  in  fines  of  up  to  €20,000,000  or  up  to  4%  of  the  total  worldwide  annual
turnover of the preceding financial year, whichever is higher, and other administrative penalties. GDPR regulations may impose additional responsibility
and liability in relation to the personal data that we process and we may be required to put in place additional mechanisms to ensure compliance with the
new data protection rules.

Employees

As of December 31, 2019, we had 22 employees, 21 of whom were full-time. Of those, 16 were engaged in research and development activities.
All company employees are located in Philadelphia, PA, or the surrounding area. We do not have any employees that are represented by a labor union or
covered under a collective bargaining agreement. We consider our relationship with our employees to be good.

Corporate History and Trademarks

We  were  incorporated  under  the  laws  of  the  State  of  Delaware  in  April  2017  under  the  name  Tycho  Therapeutics,  Inc.  In  August  2018,  our
corporate name was changed to Cabaletta Bio, Inc. Our principal executive offices are located at 2929 Arch Street, Suite 600, Philadelphia, PA 19104 and
our telephone number is (267) 759-3100. Our website address is www.cabalettabio.com. We do not incorporate the information on or accessible through
our website into this Annual Report on Form 10-K, and you should not consider any information on, or that can be accessed through, our website to be part
of this Annual Report on Form 10-K. We have included our website address in this Annual Report on Form 10-K solely as an inactive textual reference.

We view our operations and measure our business as one reportable segment. All of the Company's tangible assets are held in the United States.
Refer to Note 2, Summary of Significant Accounting Policies, to our financial statements appearing elsewhere in this Annual Report on Form 10-K for
additional information.

We own or have rights to various trademarks, service marks and trade names that we use in connection with the operation of our business. This
Annual  Report  on  Form  10-K  may  also  contain  trademarks,  service  marks  and  trade  names  of  third  parties,  which  are  the  property  of  their  respective
owners. Our use or display of third parties’ trademarks, service marks, trade names or products in this Annual Report on Form 10-K is not intended to, and
does not imply a relationship with, or endorsement or sponsorship by us. Solely for convenience, the trademarks, service marks and trade names referred to
in this Annual Report on Form 10-K may appear without the ®, ™ or SM symbols, but the omission of such references is not intended to indicate, in any
way, that we will not assert, to the fullest extent under applicable law, our rights or the right of the applicable owner of these trademarks, service marks and
trade names.

Available Information

Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and any amendments to these reports filed or
furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, are available free of charge on our website located at
www.cabalettabio.com as soon as reasonably practicable after they are filed with or furnished to the SEC. These reports are also available at the SEC’s
Internet website at www.sec.gov.

A copy of our Corporate Governance Guidelines, Code of Conduct and Business Ethics and the charters of the Audit Committee, Compensation
Committee  and  Nominating  and  Corporate  Governance  Committee  are  posted  on  our  website,  www.cabalettabio.com,  under  the  heading  “Investors  &
Media.”

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Item 1A. Risk Factors.

Our  business  involves  significant  risks,  some  of  which  are  described  below.  You  should  carefully  consider  the  risks  and  uncertainties  described
below,  together  with  all  of  the  other  information  contained  in  this  Annual  Report  on  Form  10-K,  including  "Management's  Discussion  and  Analysis  of
Financial Condition and Results of Operations" and the condensed financial statements and the related notes. If any of the following risks actually occur, it
could harm our business, prospects, operating results and financial condition and future prospects. In such event, the market price of our common stock
could decline and you could lose all or part of your investment. Additional risks and uncertainties not presently known to us or that we currently deem
immaterial may also impair our business operations. This Annual Report on Form 10-K also contains forward-looking statements that involve risks and
uncertainties. Our actual results could differ materially from those anticipated in the forward-looking statements as a result of factors that are described
below and elsewhere in this Annual Report.

Risks Related to Our Business, Technology and Industry

We are early in our development efforts. If we are unable to advance our product candidates through clinical development, obtain regulatory
approval  and  ultimately  commercialize  our  product  candidates,  or  experience  significant  delays  in  doing  so,  our  business  will  be  materially
harmed.

We are early in our development efforts. We plan to initiate our DesCAARTesTM Trial in 2020. Our ability to generate product revenues, which we
do not expect will occur for many years, if ever, will depend heavily on the successful development and eventual commercialization of one or more of our
product  candidates.  Even  if  we  are  able  to  develop  and  commercialize  a  marketable  product,  we  may  face  challenges  generating  revenue  from  product
sales. The success of our product candidates will depend on several factors, including the following:

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successful completion of preclinical studies resulting in data that is supportive of advancing to an IND submission;

successful submission and acceptance of INDs or comparable applications;

successful initiation of clinical trials;

demonstration of adequate safety to progress to a therapeutic dose level;

successful patient enrollment in and completion of clinical trials;

receipt and related terms of regulatory and marketing approvals and licensures from applicable regulatory authorities;

establishing  commercial  manufacturing  capabilities  or  making  arrangements  with  third-party  manufacturers  for  clinical  supply  and
commercial manufacturing of our product candidates;

making arrangements with various medical divisions across hospitals for administration of our product candidates, including with cancer
treatment centers to conduct leukapheresis and with the relevant hospital divisions to perform infusion;

obtaining and maintaining patent and trade secret protection and regulatory exclusivity for our product candidates;

establishing sales, marketing and distribution and patient administration capabilities and launching commercial sales of our products, if and
when licensed, whether alone or in collaboration with others;

acceptance of our products, if and when licensed, by patients, the medical community and third-party payors;

effectively competing with other therapies targeting the same indications as our product candidates;

obtaining and maintaining third-party coverage and adequate reimbursement; and

maintaining a continued acceptable safety profile of our products following licensure.

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If we do not achieve one or more of these factors in a timely manner or at all, we could experience significant delays or be unable to successfully
commercialize our product candidates, which would materially harm our business. If we do not receive regulatory approvals for our product candidates, we
may not be able to continue our operations.

Cellular  therapies,  including  our  engineered  CAAR  T  product  candidates,  represent  a  novel  approach  to  the  treatment  of  B  cell-mediated
autoimmune  diseases,  which  creates  significant  challenges  for  us.  Negative  perception  or  increased  regulatory  scrutiny  of  any  product
candidates  that  we  develop  could  adversely  affect  our  ability  to  conduct  our  business  or  obtain  regulatory  approvals  for  such  product
candidates.

Cellular therapies are a novel approach and negative perception or increased regulatory scrutiny of any product candidates that we develop could
adversely affect our ability to conduct our business or obtain regulatory approvals for such product candidates. Cellular therapies in general, and CAAR T
cell therapies in particular, remain novel therapies, with no cellular immunotherapies licensed to date in the United States or the European Union to treat
autoimmune diseases or alloimmune responses. CAAR T cell therapies may not gain the acceptance of the public or the medical community. For example,
CAR Ts and other cellular therapies have in some cases caused severe side effects, including death, and their broader use may therefore be limited. Even if
CAR  Ts  and  other  cellular  therapies  are  accepted  by  the  public  and  medical  community  in  the  short  term,  long-term  adverse  events  observed  in  these
therapies may increase negative perception and regulatory scrutiny. Although our CAAR Ts are different from CAR Ts and other cellular therapies, they
may be viewed in the same vein, limiting their market acceptance. Public perception may be influenced by claims that gene therapy, including the insertion
of  a  transgene,  is  unsafe,  and  products  incorporating  gene  therapy  may  not  gain  the  acceptance  of  the  public  or  the  medical  community.  The  patient
populations  targeted  by  our  product  candidates  are  also  typically  not  at  risk  of  near-term  death,  even  if  they  may  suffer  life-threatening  symptoms,  so
patients  will  need  to  deem  the  benefits  of  cell  therapy  to  be  worth  the  risk  of  unknown  potential  adverse  side  effects.  Our  success  will  depend  upon
physicians who specialize in the treatment of B cell-mediated autoimmune diseases targeted by our product candidates prescribing treatments that involve
the use of our product candidates in lieu of, or in addition to, existing treatments with which they are more familiar and for which greater clinical data may
be available. Adverse events in clinical trials of our product candidates or in clinical trials of others developing similar products and the resulting publicity,
as well as any other adverse events in the field of cellular therapies, could result in a decrease in demand for any product that we may develop.

We are developing a pipeline of CAAR T product candidates that are intended for use in treating individuals with B cell-mediated autoimmune

disease. Advancing these novel product candidates creates significant challenges for us, including:

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manufacturing  our  product  candidates  to  our  specifications  and  in  a  timely  manner  to  support  our  clinical  trials,  and,  if  licensed,
commercialization;

sourcing clinical and, if licensed, commercial supplies for the materials used to manufacture our product candidates;

understanding  and  addressing  variability  in  the  quality  and  quantity  of  a  subject’s  T  cells,  which  could  ultimately  affect  our  ability  to
manufacture clinical supply and, if licensed, commercial supply of our product candidates in a reliable and consistent manner;

educating medical personnel regarding the potential side effect profile of our product candidates, if licensed, such as the potential adverse
side effects related to pemphigus flare from infusion of activated T cells or medication taper, cytokine release syndrome, or CRS, or other
unexpected adverse effects of therapy with our product candidates;

facilitating patient access to the limited number of facilities able to administer our product candidates, if licensed;

using medicines to manage adverse side effects of our product candidates that may not adequately control the side effects and/or may have
a detrimental impact on the efficacy of the treatment;

potentially utilizing preconditioning agents in patients to enhance engraftment in advance of administering our product candidates, which
may increase the risk of adverse side effects;

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obtaining and maintaining regulatory approval for our product candidates, as the FDA and other regulatory authorities have limited or no
experience with development of engineered T cell therapies for the treatment of B cell-mediated autoimmune diseases;

establishing sales and marketing capabilities upon obtaining any regulatory approval to gain market acceptance of a novel therapy; and

managing costs of inputs and other supplies while scaling production.

In addition, preclinical murine and other animal models may not exist or be adequate for some or all of the B cell-mediated autoimmune diseases
we  choose  to  pursue  in  our  programs,  and  because  we  have  not  commenced  clinical  trials  of  any  of  our  product  candidates,  we  are  unable  to  predict
whether there may be short-term or long-term effects from treatment with any product candidates that we develop. In developing our product candidates,
we have not exhaustively explored different options in the method for manufacturing CAAR T cells. We may find our existing manufacturing process may
be substantially improved with future design or process changes, necessitating further clinical testing, delaying commercial launch of our first products, and
causing us to incur additional expenses. For example, while we have used a lentiviral vector in our manufacturing process, we may in the future find that
another  viral  vector  or  non-viral  vector-based  process  offers  advantages.  Switching  from  one  lentiviral  vector  to  another  or  switching  from  lentiviral  to
another  delivery  system  would  necessitate  additional  process  development  and  clinical  testing,  and  this  may  delay  the  development  of  existing  product
candidates.

In  addition,  we  do  not  know  the  doses  to  be  evaluated  in  pivotal  trials  or,  if  licensed,  commercially.  Finding  a  suitable  dose  may  delay  our
anticipated clinical development timelines. Our expectations with regard to our scalability and costs of manufacturing may vary significantly as we develop
our  product  candidates  and  understand  these  critical  factors.  We  may  experience  delays  in  developing  a  sustainable,  reproducible  and  scalable
manufacturing process or transferring that process to commercial partners, which may prevent us from completing our clinical studies or commercializing
our product candidates on a timely or profitable basis, if at all.

Moreover, our product candidates may not perform successfully in clinical trials or may be associated with adverse events that distinguish them
from the chimeric antigen receptor T, or CAR T, therapies that have previously been licensed. For instance, subjects in our clinical trials will be infused
with our proposed therapies, and may possess strongly activating soluble antibodies, which, are not present in oncology patients and when they interact
with  our  infused  product  candidates,  could  result  in  potential  adverse  side  effects,  such  as  CRS.  Unexpected  side  effects  or  clinical  outcomes  would
significantly impact our business. Adverse side effects caused by even one of our product candidates could negatively affect our ability to develop future
product candidates based on our CABA platform.

In addition, two of our current product candidates, DSG3/1-CAART and FVIII-CAART, and certain of our future product candidates may require
introducing  large  transgenes  into  T  cells,  and  lentiviral  vectors  may  have  too  limited  a  genome  capacity  to  accomplish  this  process.  We  currently  use
lentiviral vector transduction for transgene delivery. However, lentiviral vectors have a limited genome capacity that restricts the size of the transgene that
can be delivered using this vector system. For example, designing a lentiviral vector that will have sufficient capacity to introduce DSG3 CAAR and DSG1
CAAR together into T cells may not be possible. In addition to reducing lentiviral vector titers that may substantially increase the cost of gene transfer, it
may be entirely unsuccessful, thus necessitating use of alternative strategies for transfer of these larger transgenes into T cells.

Further, the clinical study requirements of the FDA and other regulatory agencies and the criteria they use to determine the safety, potency and
purity  of  a  product  candidate  are  determined  according  to  the  type,  complexity,  novelty  and  intended  use  and  market  of  the  potential  products.  The
regulatory approval process for novel product candidates such as ours is less clear, and can be more complex and consequently have higher development
risk, be more expensive and take longer than for other, better known or extensively studied pharmaceutical or other product candidates. Approvals by the
FDA for existing cell therapies treating B cell-mediated diseases, such as Kymriah (Novartis Pharmaceuticals Corporation) and Yescarta (Gilead Sciences,
Inc.), may not be indicative of what the FDA may require for approval of our therapies. Approvals by any regulatory agency may not be indicative of what
any  other  regulatory  agency  may  require  for  approval  or  what  such  regulatory  agencies  may  require  for  approval  in  connection  with  new  product
candidates. As we advance our product candidates, we will be required to consult with these regulatory agencies and comply with applicable requirements
and guidelines. If we fail to do so, we may be

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required to delay or discontinue development of such product candidates. These additional processes may result in a review and approval process that is
longer  than  we  otherwise  would  have  expected.  More  restrictive  statutory  regimes,  government  regulations  or  negative  public  opinion  would  have  an
adverse effect on our business, financial condition, results of operations and prospects and may delay or impair the development and commercialization of
our product candidates or demand for any products we may develop.

In addition, responses by agencies at the federal and state level to negative public perception or ethical concerns may result in new legislation or
regulations that could limit our ability to develop or commercialize any product candidates, obtain or maintain regulatory approval or otherwise achieve
profitability. The FDA has expressed interest in further regulating biotechnology products, such as cellular therapies. Agencies at both the federal and state
level in the United States, as well as the U.S. Congressional committees and other government entities or governing agencies have also expressed interest
in further regulating the biotechnology industry. Such action may delay or prevent commercialization of some or all of our product candidates. Adverse
developments in clinical trials of cellular therapy products conducted by others may cause the FDA or other oversight bodies to change the requirements
for approval of any of our product candidates. These regulatory review agencies and committees and the new requirements or guidelines they promulgate
may lengthen the regulatory review process, require us to perform additional studies or trials, increase our development costs, lead to changes in regulatory
positions and interpretations, delay or prevent approval and commercialization of our product candidates or lead to significant post-approval limitations or
restrictions.

Patients  receiving  T  cell-based  immunotherapies,  such  as  our  product  candidates,  may  experience  serious  adverse  events,  including
neurotoxicity, CRS and killing of cells other than the intended B cells that express the autoantibodies. If our product candidates are revealed to
have  high  and  unacceptable  severity  and/or  prevalence  of  side  effects  or  unexpected  characteristics,  their  clinical  development,  regulatory
approval, and commercial potential will be negatively impacted, which will significantly harm our business, financial condition and prospects.

Our product candidates are CAAR T cell-based immunotherapies. There is a possibility that our product candidates could have adverse side effects,
such  as  neurotoxicity  and  CRS.  In  other  similarly  designed  cellular  immunotherapies  to  treat  cancer,  there  have  been  life  threatening  events  related  to
severe neurotoxicity and CRS requiring intense medical intervention, such as intubation or medications to support blood pressure, and in several cases,
resulted  in  death.  Severe  neurotoxicity  is  a  condition  that  is  currently  defined  clinically  by  cerebral  edema,  confusion,  drowsiness,  speech  impairment,
tremors, seizures or other central nervous system side effects, when such side effects are serious enough to lead to intensive care. CRS is a condition that is
currently defined clinically by certain symptoms related to the release of cytokines, which can include fever, chills and low blood pressure, when such side
effects are serious enough to lead to intensive care with mechanical ventilation or significant medications to support blood pressure.

Our product candidates may have serious and potentially fatal targeting of cells within the body due to unexpected protein interactions with the
CAAR. Although we have completed multiple preclinical studies designed to screen for toxicity caused by unintended off-target recognition by the cell
binding  domain  of  the  DSG3  CAAR,  our  product  candidates  may  still  recognize  and  react  with  one  or  more  proteins  unrelated  to  the  intended  surface
immunoglobin target protein to which it is designed to link. If unexpected binding occurs in normal tissue, our product candidates may target and kill the
normal tissue in a patient, leading to serious and potentially fatal adverse events, undesirable side effects, toxicities or unexpected characteristics. Detection
of any unexpected targeting may halt or delay any ongoing clinical trials for our product candidates and prevent or delay regulatory approval. While we
have developed a preclinical screening process to identify cross-reactivity of our product candidates, we cannot be certain that this process will identify all
potential  tissue  that  our  product  candidates  may  target.  For  example,  a  membrane  protein  array  with  DSG3-CAART  yielded  one  weak  signal  against  a
protein  that  is  designed  to  bind  to  glycoproteins  and  which  was  detected  in  both  the  test  and  control  conditions.  Further  analysis  of  this  protein  in
confirmatory  cell-based  assays  repeatedly  demonstrated  that  DSG3-CAART  does  not  recognize  nor  activate  against  this  protein.  However,  this  further
analysis  may  prove  to  be  inaccurate.  Any  unexpected  targeting  that  impacts  patient  safety  could  materially  impact  our  ability  to  advance  our  product
candidates into clinical trials or to proceed to marketing approval and commercialization.

Results of our studies could reveal a high and unacceptable severity and prevalence of side effects or unexpected characteristics. Undesirable side

effects caused by our product candidates could cause us or regulatory

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authorities to interrupt, delay or halt clinical trials and could result in a more restrictive label or the delay or denial of regulatory approval by the FDA. The
FDA has requested and we have agreed to provide data on the subjects dosed in Part A of our Phase 1 trial of DSG3-CAART prior to dosing subjects in
Phase B. The FDA has communicated that the dosing of subjects in cohort Phase B1 is not subject to review of Part A data and that they will provide
feedback, if any, in a timely manner. In some cases, side effects such as neurotoxicity or CRS have resulted in clinical holds of ongoing clinical trials and/or
discontinuation  of  the  development  of  the  product  candidate.  Given  that  the  autoimmune  and  alloimmune  diseases  we  are  seeking  to  treat  are,  in  some
cases, less serious than the later stage cancers being treated with other immunotherapy products, we believe the FDA and other regulatory authorities likely
will apply a different benefit-risk assessment thresholds such that even if our product candidate demonstrated a similar safety profile as current CAR T
therapies, the FDA may ultimately determine that the harmful side effects outweigh the benefits and require us to cease clinical trials or deny approval of
our product candidates. We believe tolerance for adverse events in the patient population being pursued with CAAR T cell therapies will be lower than it is
in oncology, and the risks of negative impact from these toxicities may therefore be higher for us than for CAR T programs in oncology.

Furthermore, treatment-related side effects could also affect patient recruitment or the ability of enrolled patients to complete the studies or result in
potential product liability claims. In addition, these side effects may not be appropriately recognized or managed by the treating medical staff, as toxicities
resulting  from  T  cell-based  immunotherapies  are  not  normally  encountered  in  routine  medical  care.  Medical  personnel  may  need  additional  training
regarding  T  cell-based  immunotherapy  product  candidates  to  understand  their  side  effects.  Inadequate  training  in  recognizing  or  failure  to  effectively
manage the potential side effects of T cell-based immunotherapy product candidates could result in patient deaths. Any of these occurrences may harm our
business, financial condition and prospects significantly.

In addition to side effects caused by our product candidates, the preconditioning, administration process or related procedures, which we evaluate
from time to time as part of our process improvement and optimization efforts, may also cause adverse side effects. For example, severe neurotoxicity has
been noted to be associated with the use of certain lymphodepleting regimens. While we believe there are sufficient data from other CAR T programs to
suggest  that  it  is  reasonable  for  us  to  initiate  our  first  clinical  trial  of  DSG3-CAART  without  a  preconditioning  regimen,  we  cannot  be  certain  that  a
preconditioning regimen, with or without lymphodepleting agents, will not be required.

Although we plan to infuse DSG3-CAART without preconditioning initially in our planned DesCAARTesTM Trial, we may in the future use a
preconditioning regimen for our CAAR T cell product candidates, which may increase the risk of adverse side effects and impact our ability to
accurately assess the efficacy of our product candidates.

In oncology patients receiving CAR T cell therapy, a lymphodepleting preconditioning regimen is typically used to condition the patient prior to
CAR T cell infusion in order to improve tumor immunogenicity and to promote the expansion of the infused CAR T cells. Together, these effects have been
shown  to  enhance  the  clinical  activity  of  CAR  T  cells  in  oncology  patients.  These  regimens  often  include  cyclophosphamide  and  fludarabine  and  are
usually administered within the week prior to infusion of CAR T cells. Serious adverse events have been observed in some patients following CAR T cell
infusion,  and  these  include  infection,  cytokine  release  syndrome  and  neurotoxicity.  The  preconditioning  regimen  may  contribute  to  the  occurrence  and
severity of these adverse events due to its role in inducing lymphopenia, or low levels of lymphocytes in the blood, and enhanced CAR T cell activity.

Lymphodepleting preconditioning may not be required in all oncology settings for CAR T cell activity. A recent clinical trial in multiple myeloma
patients published in 2019 in The Journal of Clinical Investigation showed similar clinical activity of CAR T cell infusions in patients with or without a
lymphodepleting preconditioning regimen. Furthermore, the requirement for lymphodepleting preconditioning for potentiating engineered T cell therapy
outside  of  oncology  has  not  been  well  established.  Specifically,  the  effect  on  tumor  immunogenicity  is  not  relevant  in  settings  outside  oncology,  and
therefore the contribution of this aspect to the potential enhancing effect of preconditioning would not apply.

In  addition,  a  lymphodepleting  regimen  may  eliminate  pathogenic  B  cells  targeted  by  our  CAAR  T  cell  product  candidates.  As  a  result,  any
lymphodepleting regimen for preconditioning that we use may adversely affect our ability to use DSG3 autoantibody titers, a standard clinical assay, to
assess the activity of DSG3-CAART. An

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inability  to  use  DSG3  autoantibody  levels  to  demonstrate  the  specific  activity  of  our  CAAR  T  cell  product  candidates  may  require  us  to  rely  on  the
objective measurement of blister formation in patients, which can be a less sensitive and accurate measurement of CAAR T cell activity. This therefore
could delay efficient clinical development. As a result of these factors, including the concern that lymphodepletion may confer a potential increased safety
risk to an autoimmune patient population, we believe the inclusion of such a regimen must be justified by clinical data demonstrating the need for it in the
setting of autoimmune patients and is therefore difficult to justify in our first-in-human studies.

We therefore plan to initiate our Phase 1 trial of DSG3-CAART without a preconditioning regimen. If clinical data suggest that a preconditioning
regimen is advisable, or if FDA requires that we employ a preconditioning regimen, we may employ such a regimen. If we ultimately use a preconditioning
regimen, with or without lymphodepleting agents, prior to infusing patients with our CAAR T cell product candidates, our clinical patients may experience
increased or more severe adverse effects specifically related to the preconditioning regimen, some of which may result in death. These undesirable side
effects,  whether  associated  with  the  preconditioning  regimen  alone  or  in  combination  with  our  CAAR  T  cell  product  candidates,  could  cause  delays  in
patient enrollment in our clinical trials, could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in a change to our
clinical trial design, a more restrictive label or the delay or denial of regulatory approval by the FDA. Any of the foregoing may increase the duration and
expense of the clinical development of our product candidates or limit market acceptance of such product candidates, if approved, any of which could have
a material adverse effect on our business and financial condition. Even if we do not use a preconditioning regimen, patients may experience adverse effects
related to our CAAR T cell product candidates, and our decision to design our clinical trials without preconditioning does not eliminate the risk of those
side effects.

Our business is highly dependent on the success of our initial product candidates targeting B cell-mediated autoimmune diseases, particularly
DSG3-CAART.  All  of  our  product  candidates  will  require  significant  additional  preclinical  and  clinical  development  before  we  can  seek
regulatory approval for and launch a product commercially.

Our business and future success depend on our ability to obtain regulatory approval of, and then successfully launch and commercialize our initial
product  candidates  targeting  B  cell-mediated  autoimmune  diseases,  including  DSG3-CAART,  MuSK-CAART,  DSG3/1-CAART  and  others  that  may  be
selected from preclinical programs. Our product candidates are in the early stages of development and will require additional preclinical studies, clinical
trials,  regulatory  review  and  licensure,  substantial  investment,  access  to  sufficient  commercial  manufacturing  capacity  and  significant  marketing  efforts
before  we  can  generate  any  revenue  from  product  sales.  There  is  no  guarantee  that  we  will  be  able  to  advance  our  product  candidates  through  clinical
development or obtain marketing approval for any of our product candidates. The process for obtaining marketing approval for any product candidate is
very long and risky and there will be significant challenges for us to address in order to obtain marketing approval as planned, if at all.

Our IND was cleared in September 2019, and we plan to initiate our DesCAARTesTM Trial in 2020. DSG3-CAART has only been administered in
murine models to date, and such results may not be predictive of the results of our planned clinical trial or any future clinical trials. Because DSG3-CAART
is  the  first  product  candidate  that  we  plan  to  test  in  the  clinic,  we  may  experience  preliminary  complications  surrounding  trial  design,  protocol
establishment  and  execution,  establishing  trial  protocols,  patient  recruitment  and  enrollment,  quality  and  supply  of  clinical  doses,  or  safety  issues.  For
example,  while  the  majority  of  oncology  CAR  T  clinical  trials  have  been  conducted  with  a  lymphodepleting  or  other  preconditioning  regimen  prior  to
infusion, we do not intend to use pre-infusion lymphodepletion or other preconditioning regimen initially in our planned Phase 1 trial. However, we may
determine that use of a lymphodepleting or other preconditioning regimen is necessary for our product candidates to be successful, which could result in
delays in clinical development and will expose patients to the associated risks.

Additionally,  a  failure  of  our  planned  clinical  trial  of  DSG3-CAART  could  influence  physicians’  and  regulators’  opinions  with  regard  to  the
viability  of  our  CABA  platform  more  broadly,  particularly  if  treatment-related  side  effects  are  observed.  The  occurrence  of  any  of  these  risks  could
significantly harm our development plans and business prospects. If treatment-related side effects are observed with the administration of DSG3-CAART,
or if it is viewed as less safe, potent or pure than other therapies, our ability to develop other CAAR T cell therapies may be significantly harmed.

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Our  product  candidates  may  cause  undesirable  side  effects  or  have  other  properties  that  could  halt  their  clinical  development,  prevent  their
regulatory approval, limit their commercial potential or result in significant negative consequences.

Undesirable or unacceptable side effects caused by our product candidates could cause us or regulatory authorities to interrupt, delay or halt clinical
trials and could result in a more restrictive label or the delay or denial of regulatory approval by the FDA. Further, clinical trials by their nature utilize a
sample of the potential patient population. With a limited number of subjects and limited duration of exposure, rare and severe side effects of our product
candidates  may  only  be  uncovered  with  a  significantly  larger  number  of  patients  exposed  to  the  drug.  Undesirable  side  effects  could  also  result  in  an
expansion in the size of our clinical trials, increasing the expected costs and timeline of our clinical trials. Additionally, results of our clinical trials could
reveal a high and unacceptable severity and prevalence of side effects or unexpected characteristics.

Licensed CAR T cell therapies and those under development have shown frequent rates of CRS and neurotoxicity, and adverse events have resulted
in the death of patients. Similar adverse events could occur during treatment with our CAAR T cell product candidates. For example, activation of CAAR T
cells by patient autoantibodies or alloantibodies could stimulate CRS. When CAAR T cells are infused and the CAAR binds to soluble antibodies in the
blood or tissues of treated patients, these soluble antibodies may trigger the CAAR, resulting in an activation of the immune system that is too high, leading
to  CRS.  Further,  it  is  possible  that  patients  will  exhibit  acute  rejection  of  the  CAAR  T  cells  because  of  preexisting  immunity  to  the  antigen  within  the
CAAR. This could render our product candidates ineffective.

If  unacceptable  toxicities  or  health  risks,  including  risks  inferred  from  other  unrelated  immunotherapy  trials,  arise  in  the  development  of  our
product candidates, we could suspend or terminate our trials or the FDA, the Data Safety Monitoring Board, or DSMB, or local regulatory authorities such
as  institutional  review  board,  or  IRBs,  could  order  us  to  cease  clinical  trials.  Competent  national  health  authorities,  such  as  the  FDA,  could  also  deny
approval of our product candidates for any or all targeted indications. Treatment-related side effects could also affect patient recruitment or the ability of
enrolled subjects to complete the trial or result in potential product liability claims. In addition, these side effects may not be appropriately recognized or
managed by the treating medical staff, as toxicities resulting from T cell therapy are not normally encountered in the general patient population and by
medical personnel. We expect to have to train medical personnel using CAAR T cell product candidates to understand the side effect profile of our product
candidates  for  both  our  preclinical  studies  and  clinical  trials  and  upon  any  commercialization  of  any  of  our  product  candidates,  if  licensed.  Inadequate
training in recognizing or managing the potential side effects of our product candidates could result in patient deaths. Any of these occurrences may harm
our business, financial condition and prospects significantly.

Our  planned  preclinical  studies  and  clinical  trials  may  fail  to  demonstrate  the  safety,  potency  and  purity  of  any  of  our  product  candidates,
which would prevent or delay regulatory approval and commercialization.

Before obtaining regulatory approvals for the commercial sale of any of our product candidates, we must demonstrate through lengthy, complex
and expensive preclinical testing and clinical trials that our product candidates are safe, potent and pure for use in each target indication. Clinical trials are
expensive and can take many years to complete, and their outcomes are inherently uncertain. Failure can occur at any time during the clinical trial process.
The results of preclinical studies and early clinical trials of our product candidates may not be predictive of the results of later-stage clinical trials, including
in any post-approval studies of our product candidates. In addition, initial success in any clinical trials may not be indicative of results obtained when such
trials are completed. There is typically an extremely high rate of attrition from the failure of product candidates proceeding through clinical trials. Product
candidates  in  later  stages  of  clinical  trials  may  fail  to  show  the  desired  safety,  potency  and  purity  profile  despite  having  progressed  through  preclinical
studies and initial clinical trials.

A number of companies in the biopharmaceutical industry have suffered significant setbacks in advanced clinical trials due to lack of potency or
efficacy, insufficient durability of potency or efficacy or unacceptable safety issues, notwithstanding promising results in earlier trials, and we cannot be
certain that we will not face similar setbacks. These setbacks have been caused by, among other things, preclinical and other nonclinical findings made
while  clinical  trials  were  underway,  or  safety  or  efficacy  observations  made  in  preclinical  studies  and  clinical  trials,  including  previously  unreported
adverse events. Moreover, preclinical and clinical data are often susceptible to varying interpretations and analyses and many companies that believed their
product  candidates  performed  satisfactorily  in  preclinical  studies  and  clinical  trials  nonetheless  failed  to  obtain  FDA  or  EMA  approval.  Most  product
candidates that commence clinical trials are never approved as products.

Any preclinical studies or clinical trials that we may conduct may not demonstrate the safety, potency and purity necessary to obtain regulatory

approval to market our product candidates. If the results of our ongoing or

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future preclinical studies and clinical trials are inconclusive with respect to the safety, potency and purity of our product candidates, if we do not meet the
clinical endpoints with statistical and clinically meaningful significance, or if there are safety concerns associated with our product candidates, we may be
prevented or delayed in obtaining marketing approval for such product candidates. In some instances, there can be significant variability in safety, potency
or purity results between different preclinical studies and clinical trials of the same product candidate due to numerous factors, including changes in trial
procedures set forth in protocols, differences in the size and type of the patient populations, changes in and adherence to the clinical trial protocols and the
rate of dropout among clinical trial participants. For example, because our CAAR T cell product candidates only target approximately 0.01% to 1% of the
B  cells  in  a  patient,  they  may  not  engage  enough  of  the  target  to  achieve  adequate  engraftment  necessary  for  elimination  of  all  pathogenic  B  cells.
Insufficient  safety  or  potency  in  clinical  trials  may  delay  product  development  to  enable  time  to  modify  the  product  candidate  for  next  generation
approaches or make manufacturing changes or may lead us to discontinue development of the product candidate.

In addition, for DSG3-CAART, MuSK-CAART and any future trials that may be completed, we cannot guarantee that the FDA will interpret the
results as we do, and more trials could be required before we submit our product candidates for approval. To the extent that the results of the trials are not
satisfactory  to  the  FDA  to  support  a  marketing  application,  approval  of  our  product  candidates  may  be  significantly  delayed,  or  we  may  be  required  to
expend  significant  additional  resources,  which  may  not  be  available  to  us,  to  conduct  additional  trials  in  support  of  potential  approval  of  our  product
candidates.

Interim, topline or preliminary data from any preclinical studies or clinical trials that we conduct may change as more data become available
and are subject to audit and verification procedures that could result in material changes in the final data.

Based on a pre-IND interaction with the FDA, we expect our initial clinical trial for our lead product candidate will be open-label. From time to
time, we may publicly disclose preliminary or topline or data from our preclinical studies and clinical trials, which will be based on a preliminary analysis
of then-available data, and the results and related findings and conclusions are subject to change following a more comprehensive review of the data related
to the particular study or trial. We also make assumptions, estimations, calculations and conclusions as part of our analyses of data, and we may not have
received  or  had  the  opportunity  to  fully  and  carefully  evaluate  all  data.  Additionally,  we  expect  that  in  our  planned  DesCAARTesTM Trial, the product
candidate will be administered by intravenous infusion, using a fractionated-dose infusion scheme of escalating numbers of DSG3-CAART cells. Because
of the fractionated-dose infusion scheme, if we release topline results from our planned Phase 1 clinical trial, they may differ from the final data we observe
once all dose levels have been administered within the initial cohort.

As  a  result,  the  topline  results  that  we  report  may  differ  from  future  results  of  the  same  studies,  or  different  conclusions  or  considerations  may
qualify such results, once additional data have been received and fully evaluated. Topline data also remain subject to audit and verification procedures that
may result in the final data being materially different from the preliminary data we previously published. As a result, topline data should be viewed with
caution until the final data are available. From time to time, we may also disclose interim data from planned interim analyses in our clinical trials. Interim
data from clinical trials that we may complete are subject to the risk that one or more of the clinical outcomes may materially change as patient enrollment
continues  and  more  patient  data  become  available.  Adverse  differences  between  preliminary  or  interim  data  and  final  data  could  significantly  harm  our
business prospects. Further, disclosure of interim data by us or by our competitors could result in volatility in the price of our common stock.

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Regulatory agencies, including the FDA, may not accept or agree with our assumptions, estimates, calculations, conclusions or analyses or may
interpret or weigh the importance of data differently, which could impact the value of the particular program, the approvability or commercialization of the
particular product candidate or product and our company in general.

If the interim, topline or preliminary data that we report differ from actual results, or if others, including regulatory authorities, disagree with the
conclusions  reached,  our  ability  to  obtain  approval  for,  and  commercialize,  our  product  candidates  may  be  harmed,  which  could  harm  our  business,
operating results, prospects or financial condition.

We have no experience as a company in conducting clinical trials.

Although  our  key  employees  have  significant  experience  in  leading  clinical  development  programs,  we  have  no  experience  as  a  company  in
conducting clinical trials. In part because of this lack of experience, we cannot be certain that our ongoing preclinical studies will be completed on time or
that our planned preclinical studies and clinical trials will begin or be completed on time, if at all. Any clinical trial that we conduct, including our planned
DesCAARTesTM  Trial,  will  require  significant  financial  and  management  resources  and  reliance  on  third-party  clinical  investigators,  contract  research
organizations,  or  CROs,  and  consultants.  For  example,  the  coordination  of  the  clinical  trial  sites  for  our  DesCAARTesTM  Trial  will  be  conducted  by  a
CRO. Relying on third-party clinical investigators, CROs and consultants may force us to encounter delays and expenses that are outside of our control.

We may not be able to file INDs to commence clinical trials on the timelines we expect, and even if we are able to, the FDA may not permit us
to proceed.

We submitted an IND to the FDA to initiate a clinical trial of DSG3-CAART targeting mPV in August 2019, which was cleared by the FDA in
September 2019. The timing of submissions on future product candidates will be dependent on further preclinical and manufacturing success. We cannot be
sure that submission of an IND or IND amendment will result in the FDA allowing testing and clinical trials to begin, or that, once begun, issues will not
arise that would cause us or the FDA to suspend or terminate such clinical trials. Additionally, even if such regulatory authorities agree with the design and
implementation of the clinical trials set forth in an IND or clinical trial application, we cannot guarantee that such regulatory authorities will not change
their requirements in the future.

We may encounter substantial delays in our clinical trials or may not be able to conduct our trials on the timelines we expect or at all.

Clinical testing is expensive, time consuming and subject to uncertainty. We cannot guarantee that any clinical trials will be conducted as planned
or completed on schedule, if at all. Even if these trials begin as planned, issues may arise that could suspend or terminate such clinical trials. A failure of
one  or  more  clinical  trials  can  occur  at  any  stage  of  testing,  and  our  future  clinical  trials  may  not  be  successful.  Events  that  may  prevent  successful  or
timely completion of clinical development include:

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inability to generate sufficient preclinical, toxicology or other in vivo or in vitro data to support the initiation of clinical trials;

delays in sufficiently developing, characterizing or controlling a manufacturing process suitable for clinical trials;

delays in developing suitable assays for screening patients for eligibility for clinical trials with respect to certain product candidates;

delays in reaching a consensus with the FDA and other regulatory agencies on trial design;

delays  in  reaching  agreement  on  acceptable  terms  with  prospective  CROs  and  clinical  study  sites,  the  terms  of  which  can  be  subject  to
extensive negotiation and may vary significantly among different CROs and clinical trial sites;

delays in obtaining required institutional review board, or IRB, approval at each clinical trial site;

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imposition of a temporary or permanent clinical hold by regulatory agencies for a number of reasons, including after review of an IND
submission or amendment, or equivalent application or amendment; as a result of a new safety finding that presents unreasonable risk to
clinical  trial  participants;  a  negative  finding  from  an  inspection  of  our  clinical  study  operations  or  study  sites;  developments  on  trials
conducted by competitors for related technology that raises FDA concerns about risk to patients of the technology broadly; or if FDA finds
that the investigational protocol or plan is clearly deficient to meet its stated objectives;

delays in recruiting suitable patients to participate in our clinical trials;

delays  in  treating  one  or  more  patients,  once  enrolled,  due  to  their  inability  to  accommodate  parts  of  the  complex  study  procedures
schedule;

difficulty collaborating with patient groups and investigators;

failure by our CROs, other third parties or us to adhere to clinical trial requirements;

limitations on our recourse in our CRO relationship with Penn as compared to a CRO that is not an academic institution;

failure to perform in accordance with the FDA’s good clinical practice, or GCP, requirements or applicable regulatory guidelines in other
countries;

transfer of manufacturing processes to any new CDMO or our own manufacturing facilities or any other development or commercialization
partner for the manufacture of product candidates;

delays in having patients complete participation in a trial or return for post-treatment follow-up;

patients dropping out of a trial;

occurrence of adverse events associated with the product candidate that are viewed to outweigh its potential benefits;

changes in regulatory requirements and guidance that require amending or submitting new clinical protocols;

changes in the standard of care on which a clinical development plan was based, which may require new or additional trials;

the cost of clinical trials of our product candidates being greater than we anticipate;

clinical  trials  of  our  product  candidates  producing  negative  or  inconclusive  results,  which  may  result  in  our  deciding,  or  regulators
requiring us, to conduct additional clinical trials or abandon product development programs;

delays  or  failure  to  secure  supply  agreements  with  suitable  raw  material  suppliers,  or  any  failures  by  suppliers  to  meet  our  quantity  or
quality requirements for necessary raw materials; and

delays in manufacturing, testing, releasing, validating or importing/exporting sufficient stable quantities of our product candidates for use
in clinical trials or the inability to do any of the foregoing.

Any inability to successfully complete preclinical and clinical development could result in additional costs to us or impair our ability to generate
revenue. In addition, if we make manufacturing or formulation changes to our product candidates, we may be required to, or we may elect to, conduct
additional trials to bridge our modified product candidates to earlier versions. Clinical trial delays could also shorten any periods during which our product
candidates and products, if licensed, have patent protection and may allow our competitors to bring products to market before we do, which could impair
our ability to successfully commercialize our product candidates and may harm our business and results of operations.

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We could also encounter delays if a clinical trial is suspended or terminated by us, by the DSMB for such trial or by the FDA or other regulatory
authority, or if the IRBs of the institutions in which such trials are being conducted suspend or terminate the participation of their clinical investigators and
sites subject to their review. Such authorities may suspend or terminate a clinical trial due to a number of factors, including failure to conduct the clinical
trial  in  accordance  with  regulatory  requirements  or  our  clinical  protocols,  inspection  of  the  clinical  trial  operations  or  trial  site  by  the  FDA  or  other
regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, failure to demonstrate a benefit from
using a product candidate, changes in governmental regulations or administrative actions or lack of adequate funding to continue the clinical trial.

Delays  in  the  initiation,  conduct  or  completion  of  any  clinical  trial  of  our  product  candidates  will  increase  our  costs,  slow  down  our  product
candidate development and approval process and delay or potentially jeopardize our ability to commence product sales and generate revenue. In addition,
many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may also ultimately lead to the denial of regulatory
approval of our product candidates. In the event we identify any additional product candidates to pursue, we cannot be sure that submission of an IND will
result in the FDA allowing clinical trials to begin in a timely manner, if at all. Any of these occurrences may significantly harm our business, financial
condition and prospects.

Monitoring safety of patients receiving our product candidates will be challenging, which could adversely affect our ability to obtain regulatory
approval and commercialize our product candidates.

For our planned clinical trials of DSG3-CAART and our other product candidates, we expect to continue to contract with Penn and other academic
medical centers and hospitals experienced in the assessment and management of toxicities arising during clinical trials. In the future, we may also contract
with non-academic medical centers and hospitals with similar capabilities. Nonetheless, these centers and hospitals may have difficulty observing patients,
including due to failure by patients to comply with post-clinical trial follow-up programs, and treating toxicities, which may be more challenging due to
personnel changes, inexperience, shift changes, house staff coverage or related issues. This could lead to more severe or prolonged toxicities or even patient
deaths, which could result in us or the FDA delaying, suspending or terminating one or more of our clinical trials, and which could jeopardize regulatory
approval. We also expect the centers using DSG3-CAART and our other product candidates, if licensed, on a commercial basis could have similar difficulty
in managing adverse events. Medicines used at centers to help manage adverse side effects of DSG3-CAART and our other product candidates may not
adequately control the side effects and/or may have a detrimental impact on the efficacy of the treatment.

If we encounter difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely
affected.

We  may  experience  difficulties  in  patient  enrollment  in  our  clinical  trials  for  a  variety  of  reasons.  The  timely  completion  of  clinical  trials  in
accordance  with  their  protocols  depends,  among  other  things,  on  our  ability  to  enroll  a  sufficient  number  of  patients  who  remain  in  the  trial  until  its
conclusion. The enrollment of patients depends on many factors, including:

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•

the size and nature of the patient population;

the patient eligibility criteria defined in the protocol;

the size of the patient population required for analysis of the trial’s primary endpoints;

recruiting an adequate number of suitable patients to participate in a clinical trial;

reaching  agreement  on  acceptable  terms  with  prospective  CROs  and  clinical  trial  sites,  the  terms  of  which  can  be  subject  to  extensive
negotiation and may vary significantly among different CROs and clinical trial sites;

obtaining IRB approval at each clinical trial site;

the proximity of patients to trial sites;

the design of the trial and whether the FDA agrees to the design and implementation of the trial;

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our  ability  to  identify  clinical  trial  sites  and  recruit  clinical  trial  investigators  with  the  appropriate  capabilities,  competencies  and
experience;

clinicians’  and  patients’  perceptions  as  to  the  potential  advantages  and  risks  of  the  product  candidate  being  studied  in  relation  to  other
available therapies, including any new drugs that may be approved for the indications we are investigating;

the occurrence of dose-limiting toxicity in the clinical trial;

the efforts to facilitate timely enrollment in clinical trials;

the patient referral practices of physicians;

the ability to monitor patients adequately during and after treatment;

our ability to obtain and maintain patient consents;

the risk that patients enrolled in clinical trials will drop out of the trials before the infusion of our product candidates or trial completion;
and

the ability of patients to meet the complex follow-up requirements of the clinical trial.

In addition, our clinical trials will compete with other clinical trials for product candidates that are in the same therapeutic areas as our product
candidates, and this competition will reduce the number and types of patients available to us because some patients who might have opted to enroll in our
trials may instead opt to enroll in a trial being conducted by one of our competitors. Since the number of qualified clinical investigators is limited, some of
our clinical trial sites may also be used by some of our competitors, which may reduce the number of patients who are available for our clinical trials in that
clinical trial site.

Moreover,  because  our  product  candidates  represent  a  departure  from  more  commonly  used  methods  for  B  cell-mediated  autoimmune  disease
treatment,  potential  patients  and  their  doctors  may  be  inclined  to  use  conventional  therapies,  such  as  corticosteroids  or  systemic  immunosuppressive
medications, rather than enroll patients in our clinical trial.

Delays in patient enrollment may result in increased costs or may affect the timing or outcome of our planned clinical trials, which could prevent

completion of these trials and adversely affect our ability to advance the development of our product candidates.

Our planned initial Phase 1 clinical trial and expected Phase 1 clinical trials for each of our product candidates will be pilot dose escalation studies
with a limited number of patients. The activity and toxicity data from these clinical trials of our product candidates may differ from future results of Phase
2 and/or Phase 3 clinical trials that enroll a larger number of patients.

Since  the  number  of  patients  that  we  plan  to  dose  in  our  planned  DesCAARTesTM  Trial  is  small,  the  results  from  such  clinical  trial,  once
completed, may be less reliable than results achieved in larger clinical trials, which may hinder our efforts to obtain regulatory approval for our product
candidates. In our planned DesCAARTesTM Trial, we plan to evaluate the toxicity profile of DSG3-CAART and establish the recommended dose for the
next clinical trial. The preliminary results of clinical trials with smaller sample sizes, such as our planned DesCAARTesTM Trial, can be disproportionately
influenced by various biases associated with the conduct of small clinical trials, such as the potential failure of the smaller sample size to accurately depict
the features of the broader patient population, which limits the ability to generalize the results across a broader community, thus making the clinical trial
results less reliable than clinical trials with a larger number of patients. As a result, there may be less certainty that such product candidates would achieve a
statistically  significant  effect  in  any  future  clinical  trials.  If  we  conduct  any  future  clinical  trials  of  DSG3-CAART,  we  may  not  achieve  a  statistically
significant result or the same level of statistical significance, if any, that we might have anticipated based on the results observed in our initial Phase 1
clinical trial.

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The market opportunities for our product candidates may be limited to those patients who are ineligible for or have failed prior treatments and
may be small.

Our projections of both the number of people who have the B cell-mediated autoimmune diseases we are targeting, as well as the subset of people
with  these  diseases  in  a  position  to  receive  second  or  later  lines  of  therapy  and  who  have  the  potential  to  benefit  from  treatment  with  our  product
candidates, are based on our beliefs and estimates. These estimates have been derived from a variety of sources, including scientific literature, surveys of
clinics, patient foundations, or market research and may prove to be incorrect. Further, new studies may change the estimated incidence or prevalence of
these  B  cell-mediated  autoimmune  diseases.  The  number  of  patients  may  turn  out  to  be  lower  than  expected.  Additionally,  the  potentially  addressable
patient population for our product candidates may be limited or may not be amenable to treatment with our product candidates. For instance, we expect our
lead product candidate, DSG3-CAART, to initially target a small patient population that suffers from mPV. Even if we obtain significant market share for
our product candidates, because the potential target populations are small, we may never achieve profitability without obtaining regulatory approval for
additional indications.

We may not be successful in our efforts to identify additional product candidates. Due to our limited resources and access to capital, we must
prioritize development of certain product candidates, which may prove to be wrong and may adversely affect our business.

Although we intend to explore other therapeutic opportunities, in addition to the product candidates that we are currently developing, we may fail
to identify viable new product candidates for clinical development for a number of reasons. If we fail to identify additional potential product candidates,
our business could be materially harmed.

Research programs to pursue the development of our existing and planned product candidates for additional indications and to identify new product
candidates  and  disease  targets  require  substantial  technical,  financial  and  human  resources  whether  or  not  they  are  ultimately  successful.  Our  research
programs may initially show promise in identifying potential indications and/or product candidates, yet fail to yield results for clinical development for a
number of reasons, including:

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the research methodology used may not be successful in identifying potential indications and/or product candidates;

potential product candidates may be identified but may not be able to be expressed on T cells in a manner that enables product activity;

potential product candidates may, after further study, be shown to have harmful adverse effects or other characteristics that indicate they are
unlikely to be effective drugs; or

it  may  take  greater  human  and  financial  resources  than  we  will  possess  to  identify  additional  therapeutic  opportunities  for  our  product
candidates or to develop suitable potential product candidates through internal research programs, thereby limiting our ability to develop,
diversify and expand our product portfolio.

Because we have limited financial and human resources, we intend to initially focus on research programs and product candidates for a limited set
of indications. As a result, we may forego or delay pursuit of opportunities with other product candidates or for other indications that later prove to have
greater commercial potential or a greater likelihood of success. Our resource allocation decisions may cause us to fail to capitalize on viable commercial
products or profitable market opportunities.

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Accordingly, there can be no assurance that we will ever be able to identify additional therapeutic opportunities for our product candidates or to
develop suitable potential product candidates through internal research programs, which could materially adversely affect our future growth and prospects.
We may focus our efforts and resources on potential product candidates or other potential programs that ultimately prove to be unsuccessful.

If we fail to develop additional product candidates, our commercial opportunity will be limited.

One  of  our  core  strategies  is  to  pursue  clinical  development  of  additional  product  candidates  beyond  DSG3-CAART,  MuSK-CAART,  DSG3/1-
CAART  and  FVIII-CAART.  Developing,  obtaining  regulatory  approval  and  commercializing  additional  CAAR  T  cell  product  candidates  will  require
substantial additional funding and is prone to the risks of failure inherent in medical product development. We cannot provide you any assurance that we
will be able to successfully advance any of these additional product candidates through the development process.

Even if we receive FDA approval to market additional product candidates for the treatment of B cell-mediated autoimmune diseases, we cannot
assure  you  that  any  such  product  candidates  will  be  successfully  commercialized,  widely  accepted  in  the  marketplace  or  more  effective  than  other
commercially available alternatives. If we are unable to successfully develop and commercialize additional product candidates, our commercial opportunity
will be limited. Moreover, a failure in obtaining regulatory approval of additional product candidates may have a negative effect on the approval process of
any other, or result in losing approval of any approved, product candidate.

We  currently  have  no  marketing  and  sales  organization  and  as  a  company  have  no  experience  in  marketing  products.  If  we  are  unable  to
establish marketing and sales capabilities or enter into agreements with third parties to market and sell our product candidates, we may not be
able to generate product revenue.

We currently have no sales, marketing or distribution capabilities and as a company have no experience in marketing pharmaceutical products. We
intend to develop an in-house marketing organization and sales force, which will require significant capital expenditures, management resources and time.
We  will  have  to  compete  with  other  pharmaceutical  and  biotechnology  companies  to  recruit,  hire,  train  and  retain  marketing  and  sales  personnel.
Additionally, there are risks involved with establishing our own sales, marketing and distribution capabilities. For example, recruiting and training a sales
force is expensive and time-consuming and could delay any product launch. If the commercial launch of a product candidate for which we recruit a sales
force  and  establish  marketing  capabilities  is  delayed  or  does  not  occur  for  any  reason,  we  would  have  prematurely  or  unnecessarily  incurred  these
commercialization  expenses.  These  efforts  may  be  costly,  and  our  investment  would  be  lost  if  we  cannot  retain  or  reposition  our  sales  and  marketing
personnel.

If we are unable or decide not to establish internal sales, marketing and distribution capabilities, we will need to pursue collaborative arrangements
regarding  the  sales  and  marketing  of  our  products,  if  licensed.  However,  there  can  be  no  assurance  that  we  will  be  able  to  establish  or  maintain  such
collaborative arrangements, or if we are able to do so, that they will have effective sales forces. Any revenue we receive will depend upon the efforts of
such third parties, which may not be successful. Our product revenues and profitability, if any, are likely to be lower than if we were to market, sell and
distribute any products that we develop ourselves. In addition, we may have little or no control over the marketing and sales efforts of such third parties and
our revenue from product sales may be lower than if we had commercialized our product candidates ourselves. We also face competition in our search for
third parties to assist us with the sales and marketing efforts of our product candidates.

There can be no assurance that we will be able to develop in-house sales and distribution capabilities or establish or maintain relationships with

third-party collaborators to commercialize any product in the United States or overseas.

We  face  significant  competition  from  other  biotechnology  and  pharmaceutical  companies,  and  our  operating  results  will  suffer  if  we  fail  to
compete effectively.

The biopharmaceutical and pharmaceutical industries are characterized by rapidly advancing technologies, intense competition and a strong focus
on  intellectual  property.  We  face  competition  from  many  different  players,  including  large  and  specialty  pharmaceutical  and  biotechnology  companies,
academic research organizations and

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governmental agencies. Any therapeutic candidates we successfully develop and commercialize will compete with the existing standard of care as well as
novel therapies that may gain regulatory approval in the future. Many of our competitors have substantially greater financial, technical and other resources,
such as larger research and development staff and experienced marketing and manufacturing organizations and well-established sales forces. Smaller or
early-stage  companies  may  also  prove  to  be  significant  competitors,  particularly  through  collaborative  arrangements  with  large,  established  companies.
Mergers and acquisitions in the biotechnology and pharmaceutical industries may result in even more resources being concentrated in our competitors. We
believe  we  are  the  first  and  only  company  developing  CAAR  T  drug  candidates  for  the  treatment  of  B  cell-mediated  autoimmune  diseases.  However,
despite  the  significant  differences  in  discovery,  development  and  target  populations  between  oncology  and  autoimmune  targets,  we  recognize  that
companies  with  an  investment  and  expertise  in  CAR  T  cell  development  for  oncology  indications  could  attempt  to  leverage  their  expertise  into  B  cell-
mediated  autoimmune  disease  affected  populations.  Competition  may  increase  further  as  a  result  of  advances  in  the  commercial  applicability  of
technologies and greater availability of capital for investment in these industries. Our competitors, either alone or with collaborative partners, may succeed
in  developing,  acquiring  or  licensing  on  an  exclusive  basis  drug  or  biologic  products  that  are  more  effective,  safer,  more  easily  commercialized  or  less
costly  than  our  product  candidates  or  may  develop  proprietary  technologies  or  secure  patent  protection  that  we  may  need  for  the  development  of  our
technologies and products.

Specifically, while rituximab is the first drug for the treatment of PV, the target indication of our lead product candidate, DSG3-CAART, to have
received  regulatory  approval  in  the  United  States  in  over  60  years,  we  are  aware  that  multiple  biopharmaceutical  companies  have  therapies  in  clinical
development. We are also aware of other biopharmaceutical companies developing therapies for muscle-specific kinase myasthenia gravis, or MuSK MG,
and Hemophilia A patients who develop alloantibodies against FVIII. While we do not expect these product candidates to be directly competitive to our
product  candidates,  even  if  we  obtain  regulatory  approval  of  our  product  candidates,  the  availability  and  price  of  these  other  products  could  limit  the
demand and the price we are able to charge for our product candidates. We may not be able to implement our business plan if the acceptance of our product
candidates is inhibited by price competition or the reluctance of physicians to switch from existing methods of treatment to our product candidates, or if
physicians  switch  to  other  new  drug  or  biologic  products  or  choose  to  reserve  our  product  candidates  for  use  in  limited  circumstances.  For  additional
information regarding our competition, see “Business—Competition”.

We are highly dependent on our key personnel, and if we are not successful in attracting and retaining highly qualified personnel, we may not
be able to successfully implement our business strategy.

Our ability to compete in the highly competitive biotechnology and pharmaceutical industries depends upon our ability to attract and retain highly
qualified managerial, scientific and medical personnel. We are highly dependent on our management, scientific, and medical personnel, including our Chief
Executive  Officer  and  President,  our  Scientific  Advisory  Board  members,  our  Chief  Medical  Officer,  our  Executive  Vice  President,  Science  and
Technology, and our Chief Financial Officer. The loss of the services of any of our executive officers, other key employees, and other scientific and medical
advisors, and our inability to find suitable replacements could result in delays in product development and harm our business.

Competition  for  skilled  personnel  in  our  market  is  intense  and  may  limit  our  ability  to  hire  and  retain  highly  qualified  personnel  on  acceptable
terms or at all. To induce valuable employees to remain at our company, in addition to salary and cash incentives, we have provided stock options that vest
over time. The value to employees of stock options that vest over time may be significantly affected by movements in our stock price that are beyond our
control and may at any time be insufficient to counteract more lucrative offers from other companies. Despite our efforts to retain valuable employees,
members of our management, scientific and development teams may terminate their employment with us on short notice. Although we have employment
agreements with our key employees, these employment agreements provide for at-will employment, which means that any of our employees could leave
our employment at any time, with or without notice. We do not maintain “key person” insurance policies on the lives of these individuals or the lives of any
of  our  other  employees.  Our  success  also  depends  on  our  ability  to  continue  to  attract,  retain  and  motivate  highly  skilled  junior,  mid-level  and  senior
managers as well as junior, mid-level and senior scientific and medical personnel.

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We expect to grow the size of our organization, and we may experience difficulties in managing this growth.

As  of  December  31,  2019,  we  had  21  full-time  employees  and  one  part-time  employee.  As  our  development  and  commercialization  plans  and
strategies develop, and as we continue to transition into operating as a public company, we expect to rapidly expand our employee base and continue to add
managerial,  operational,  sales,  research  and  development,  marketing,  financial  and  other  personnel.  For  example,  we  are  still  dependent  on  Penn  and
certain  Penn-affiliated  entities  to  continue  providing  certain  research  and  development  as  well  as  manufacturing  services  under  that  certain  research
services agreement. Current and future growth imposes significant added responsibilities on members of management, including:

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identifying, recruiting, integrating, maintaining and motivating additional employees;

managing  our  internal  development  efforts  effectively,  including  the  clinical  and  FDA  review  process  for  our  product  candidates,  while
complying with our contractual obligations to contractors and other third parties; and

improving our operational, financial and management controls, reporting systems and procedures.

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Our future financial performance and our ability to commercialize our product candidates will depend, in part, on our ability to effectively manage
our growth, and our management may also have to divert a disproportionate amount of its attention away from day-to-day activities in order to devote a
substantial amount of time to managing these growth activities.

We  currently  rely,  and  for  the  foreseeable  future  will  continue  to  rely,  in  substantial  part  on  certain  independent  organizations,  advisors  and
consultants to provide certain services, including certain research and development as well as general and administrative support, pursuant to agreements
which expire after a certain period of time. There can be no assurance that the services of independent organizations, advisors and consultants will continue
to be available to us on a timely basis when needed, or that we can find qualified replacements. In addition, if we are unable to effectively manage our
outsourced  activities  or  if  the  quality  or  accuracy  of  the  services  provided  by  consultants  is  compromised  for  any  reason,  our  clinical  trials  may  be
extended, delayed or terminated, and we may not be able to obtain regulatory approval of our product candidates or otherwise advance our business. There
can be no assurance that we will be able to manage our existing consultants or find other competent outside contractors and consultants on economically
reasonable terms, or at all.

If we are not able to effectively expand our organization by hiring new employees and expanding our groups of consultants and contractors, or if
we are not able to raise sufficient funds in the future to support our hiring efforts beyond our research and development personnel, we may not be able to
successfully implement the tasks necessary to further develop and commercialize our product candidates and, accordingly, may not achieve our research,
development and commercialization goals.

Business disruptions could seriously harm our future revenue and financial condition and increase our costs and expenses.

Our operations, Penn’s operations and those of any CDMOs, CROs and other contractors and consultants that we may engage could be subject to
earthquakes,  power  shortages,  telecommunications  failures,  water  shortages,  floods,  hurricanes,  typhoons,  fires,  extreme  weather  conditions,  medical
epidemics and other natural or man-made disasters or business interruptions, for which we are predominantly self-insured. The occurrence of any of these
business disruptions could seriously harm our operations and financial condition and increase our costs and expenses. We currently rely on Penn to produce
and process our first product candidate and anticipate that in the future we will rely on a third-party CDMO for the same. Our ability to obtain clinical
supplies of our product candidates could be disrupted if the operations of these suppliers are affected by a man-made or natural disaster or other business
interruption.

Even if we obtain regulatory approval of our product candidates, the products may not gain the market acceptance among physicians, patients,
hospitals, treatment centers and others in the medical community necessary for commercial success.

The  use  of  engineered  T  cells  as  a  potential  treatment  for  B  cell-mediated  autoimmune  diseases  is  a  recent  development  and  may  not  become
broadly  accepted  by  physicians,  patients,  hospitals,  treatment  centers  and  others  in  the  medical  community.  We  expect  physicians  to  be  particularly
influential and we may not be able to convince them to use our product candidates for many reasons. Additional factors will influence whether our product
candidates are accepted in the market, including:

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the clinical indications for which our product candidates are licensed;

physicians, hospitals, treatment centers and patients considering our product candidates as a safe and effective treatment;

the potential and perceived advantages of our product candidates over alternative treatments;

the prevalence and severity of any side effects;

product labeling or product insert requirements of the FDA or other regulatory authorities;

limitations or warnings contained in the labeling approved by the FDA;

the timing of market introduction of our product candidates as well as competitive products;

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the cost of treatment in relation to alternative treatments;

the availability of coverage and adequate reimbursement and pricing by third-party payors and government authorities;

the  willingness  of  patients  to  pay  out-of-pocket  in  the  absence  of  coverage  and  adequate  reimbursement  by  third-party  payors  and
government authorities;

relative convenience and ease of administration, including as compared to alternative treatments and competitive therapies; and

the effectiveness of our sales and marketing efforts.

The product candidates we plan to develop and commercialize are premised on offering a potential cure for B cell-mediated autoimmune diseases,
which  may  result  in  a  high  degree  of  uncertainty  related  to  pricing  and  long-term  demand  for  our  product.  Our  target  patient  populations  are  relatively
small.  Because  of  this  pricing  and  demand  for  our  product  candidates,  if  licensed,  may  not  be  adequate  to  support  an  extended  period  of  commercial
viability, which could adversely affect our continued ability to successfully produce and market our product or any follow-on products.

In addition, if our product candidates are licensed but fail to achieve market acceptance among physicians, patients, hospitals, treatment centers or
others in the medical community, we will not be able to generate significant revenue. Even if our products achieve market acceptance, we may not be able
to maintain that market acceptance over time if new products or technologies are introduced that are more favorably received than our products, are more
cost effective or render our products obsolete.

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of our
product candidates.

We face an inherent risk of product liability as a result of the clinical testing of our product candidates and will face an even greater risk if we
commercialize any products. For example, we may be sued if our product candidates cause or are perceived to cause injury or are found to be otherwise
unsuitable during clinical testing, manufacturing, marketing or sale. Any such product liability claims may include allegations of defects in manufacturing,
defects in design, a failure to warn of dangers inherent in the product, negligence, strict liability or a breach of warranties. Claims could also be asserted
under state consumer protection acts. If we cannot successfully defend ourselves against product liability claims, we may incur substantial liabilities or be
required  to  limit  commercialization  of  our  product  candidates.  Even  successful  defense  would  require  significant  financial  and  management  resources.
Regardless of the merits or eventual outcome, liability claims may result in:

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inability to bring our product candidates to the market;

decreased demand for our product candidates;

injury to our reputation;

withdrawal of clinical trial participants;

initiation of investigations by regulators;

costs to defend the related litigation;

a diversion of management’s time and our resources;

substantial monetary awards to trial participants or patients;

product recalls, withdrawals or labeling, marketing or promotional restrictions;

loss of revenue;

exhaustion of any available insurance and our capital resources;

the inability to commercialize any product candidate; and

a decline in our share price.

Since we have not yet commenced marketing of any products, we do not yet hold product liability insurance for commercialization of our product

candidates. Our inability to obtain sufficient product liability insurance at an

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acceptable cost to protect against potential product liability claims could prevent or inhibit the commercialization of products we develop, alone or with
corporate collaborators. Our insurance policies may also have various exclusions, and we may be subject to a product liability claim for which we have no
coverage.  Assuming  we  obtained  clinical  trial  insurance  for  our  clinical  trials,  we  may  have  to  pay  amounts  awarded  by  a  court  or  negotiated  in  a
settlement that exceed our coverage limitations or that are not covered by our insurance, and we may not have, or be able to obtain, sufficient capital to pay
such amounts. Even if our agreements with any future corporate collaborators entitle us to indemnification against losses, such indemnification may not be
available or adequate should any claim arise.

Risks Related to Our Financial Condition and Capital Requirements

We have incurred net losses in every period since our inception and anticipate that we will incur substantial net losses over the next several
years, and may never achieve or maintain profitability.

Investment  in  biopharmaceutical  product  development  is  highly  speculative  because  it  entails  substantial  upfront  capital  expenditures  and
significant risk that any potential product candidate will fail to demonstrate adequate effect or an acceptable safety profile, gain regulatory approval and
become  commercially  viable.  We  have  only  recently  licensed  rights  to  the  patents  underlying  our  product  candidates  and  plan  to  initiate  our
DesCAARTesTM Trial in 2020. We have no products licensed for commercial sale, and we will continue to incur significant research and development and
other  expenses  related  to  our  ongoing  operations.  Our  net  losses  may  fluctuate  significantly  from  quarter  to  quarter  and  year  to  year.  We  have  to  date
financed our operations primarily through private placements of our preferred stock.

As a result, we are not profitable and have incurred net losses in each period since our inception. For the years ended December 31, 2019 and 2018,
we recorded net losses of $16.9 million and $12.2 million, respectively. As of December 31, 2019, we had an accumulated deficit of $33.0 million. We
expect to incur significant losses for the foreseeable future, and we expect these losses to increase substantially if, and as, we:

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continue  our  research  and  development  efforts  and  submit  additional  Investigational  New  Drug  applications,  or  INDs,  for  our  product
candidates;

conduct preclinical studies and clinical trials for our current and future product candidates;

further develop our product candidate platform;

continue to discover and develop additional product candidates;

maintain, expand and protect our intellectual property portfolio;

hire additional clinical, scientific manufacturing and commercial personnel;

establish a commercial manufacturing source and secure supply chain capacity sufficient to provide commercial quantities of any product
candidates  for  which  we  may  obtain  regulatory  approval,  whether  through  a  contract  development  and  manufacturing  organization,  or
CDMO, or through a manufacturing facility that we establish;

acquire or in-license other product candidates and technologies, including advanced manufacturing and translational capabilities that we
will need for the further development and possible commercialization of our product candidates;

seek marketing approvals for any product candidates that successfully complete clinical trials;

establish a sales, marketing and distribution infrastructure to support the sales and marketing of any product candidates for which we may
obtain marketing approvals; and

add operational, financial and management information systems and personnel, including personnel to support our product development
and planned future commercialization efforts, as well as to support our transition to a public company.

To become and remain profitable, we must succeed in developing, and eventually commercializing, a product or products that generate significant
revenue. The ability to achieve this success will require us to be effective in a range of challenging activities, including completing preclinical testing and
clinical trials of our product candidates,

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discovering  additional  product  candidates,  obtaining  regulatory  approval  for  these  product  candidates  and  manufacturing,  marketing  and  selling  any
products for which we may obtain regulatory approval. We are only in the preliminary stages of most of these activities and have not yet demonstrated our
ability to successfully develop any product candidate, obtain regulatory approvals, manufacture a commercial scale product or arrange for a third party to
do  so  on  our  behalf,  or  conduct  sales  and  marketing  activities  necessary  for  successful  product  commercialization.  We  may  never  be  able  to  develop,
manufacture or commercialize a marketable product.

Even if we are able to succeed in these activities, we may never generate revenues that are significant enough to achieve profitability. Because of
the  numerous  risks  and  uncertainties  associated  with  pharmaceutical  product  development,  we  are  unable  to  accurately  predict  the  timing  or  amount  of
increased expenses or when, or if, we will be able to achieve profitability. Our expenses will increase if, among other things:

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there are any delays in completing our clinical trials or the development of any of our product candidates;

we  are  required  by  the  U.S.  Food  and  Drug  Administration,  or  the  FDA,  or  other  regulatory  authorities  to  perform  trials  or  studies  in
addition to, or different than, those expected; or

there are any third-party challenges to our intellectual property or we need to defend against any intellectual property-related claim.

Because  of  the  numerous  risks  and  uncertainties  associated  with  pharmaceutical  product  development,  we  are  unable  to  accurately  predict  the
timing or amount of increased expenses we will incur or when, if ever, we will be able to achieve profitability. Even if we succeed in commercializing one
or  more  of  our  product  candidates,  we  will  continue  to  incur  substantial  research  and  development  and  other  expenditures  to  develop,  seek  regulatory
approval  for  and  market  additional  product  candidates.  We  may  encounter  unforeseen  expenses,  difficulties,  complications,  delays  and  other  unknown
factors that may adversely affect our business. The size of our future net losses will depend, in part, on the rate of future growth of our expenses and our
ability to generate revenue. Our prior losses and expected future losses have had and will continue to have an adverse effect on our stockholders’ equity and
working capital.

We have a limited operating history, which may make it difficult for you to evaluate the success of our business to date and to assess our future
viability, and we may face significant challenges and expense as we test our product candidates and build our capabilities.

We were incorporated in 2017 and initially acquired rights to license certain patent rights Penn in August 2018. We are early in our development
efforts, have a limited operating history and are subject to the risks inherent to any newly-formed organization, including, among others, risks that we may
not be able to hire sufficient qualified personnel and establish operating controls and procedures.

Our limited operating history, particularly in light of the rapidly evolving cell therapy field, may make it difficult to evaluate our technology and
industry and predict our future performance. Our short history as an operating company makes any assessment of our future success or viability subject to
significant uncertainty. We will encounter risks and difficulties frequently experienced by early-stage companies in rapidly evolving fields. If we do not
address these risks successfully, our business will suffer. Similarly, we expect that our financial condition and operating results will fluctuate significantly
from quarter to quarter and year to year due to a variety of factors, many of which are beyond our control. As a result, our shareholders should not rely
upon the results of any quarterly or annual period as an indicator of future operating performance.

We currently do not have in-house resources sufficient to enable our chimeric autoantibody receptor, or CAAR, T cell platform. We are reliant on
several manufacturing and support services from Penn through a Master Translational Research Services Agreement, or the Services Agreement, as well as
certain research and development and general and administrative services through two sponsored research agreements. We also rely on Penn for access to
key technologies for current manufacturing of our product candidates. As we build our own capabilities, and enter into agreements with third parties, we
expect  to  encounter  risks  and  uncertainties  frequently  experienced  by  growing  companies  in  new  and  rapidly  evolving  fields,  including  the  risks  and
uncertainties described herein. Our ability to rely on services from Penn is limited to a specified period of time, to specific capabilities, and is subject to
Penn’s right to terminate these services with or without cause. If we are unable to establish necessary

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relationships with third party partners and build our own capabilities, our operating and financial results could differ materially from our expectations, and
our business could suffer.

All of our programs require additional preclinical research and development, clinical development, regulatory approval in multiple jurisdictions,
obtaining  manufacturing  supply,  capacity  and  expertise,  building  of  a  commercial  organization,  substantial  investment  and  significant  marketing  efforts
before  we  generate  any  revenue  from  product  sales.  Other  programs  of  ours  require  additional  discovery  research  and  then  preclinical  and  clinical
development. In addition, our product candidates must be licensed for marketing by the FDA before we may commercialize any product.

In  addition,  as  an  early-stage  company,  we  have  encountered  and  may  continue  to  encounter  unforeseen  expenses,  difficulties,  complications,
delays and other known and unknown circumstances. As we advance our product candidates, we will need to transition from a company with a research
focus to a company capable of supporting clinical development and if successful, commercial activities. We may not be successful in such a transition.

We have not generated any revenue from our product candidates and our ability to generate revenue from product sales and become profitable
depends significantly on our success in a number of areas.

To  become  and  remain  profitable,  we  or  any  potential  future  collaborator  must  develop  and  eventually  commercialize  products  with  significant
market  potential  at  an  adequate  profit  margin  after  cost  of  goods  sold  and  other  expenses.  All  of  our  product  candidates  are  in  the  early  stages  of
development  and  we  will  require  additional  preclinical  studies,  clinical  development,  regulatory  review  and  approval,  substantial  investment,  access  to
sufficient commercial manufacturing capacity and significant marketing efforts before we can generate any revenue from product sales. We plan to initiate
our DesCAARTesTM Trial, our most advanced product candidate, targeting pathogenic B cells in patients with mucosal pemphigus vulgaris, or mPV, in
2020. Our other product candidates, which include DSG3/1-CAART, targeting pathogenic B cells in patients with mucocutaneous pemphigus vulgaris, or
mcPV,  MuSK-CAART,  targeting  pathogenic  B  cells  in  a  subset  of  patients  with  myasthenia  gravis,  or  MG,  and  FVIII-CAART,  for  potential  use  as  an
adjunctive  therapy  targeting  a  subset  of  patients  with  Hemophilia  A  who  develop  alloantibody  resistance  to  Factor  VIII,  or  FVIII,  replacement  therapy,
have  yet  to  complete  IND-enabling  studies.  We  have  not  yet  administered  any  of  our  product  candidates  in  humans  and,  as  such,  we  face  significant
translational risk as our product candidates advance to the clinical stage. Our ability to generate revenue depends on a number of factors, including, but not
limited to:

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timely completion of our preclinical studies and clinical trials, which may be significantly slower or cost more than we currently anticipate
and will depend substantially upon the performance of third-party academic and commercial contractors;

our ability to complete IND-enabling studies and successfully submit INDs or comparable applications;

whether we are required by the FDA to conduct additional clinical trials or other studies beyond those planned to support the licensure and
commercialization of our product candidates or any future product candidates;

our ability to demonstrate to the satisfaction of the FDA the safety, potency, purity and acceptable risk to benefit profile of our product
candidates or any future product candidates;

the  prevalence,  duration  and  severity  of  potential  side  effects  or  other  safety  issues  experienced  with  our  product  candidates  or  future
product candidates, if any;

the cost of manufacturing and processing our product candidates being greater than we anticipate;

the timely receipt of necessary marketing approvals from the FDA;

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the willingness of physicians, operators of clinics and patients to utilize or adopt any of our product candidates or future product candidates
to treat B cell-mediated autoimmune diseases;

our ability and the ability of third parties with whom we contract to manufacture adequate clinical and commercial supplies of our product
candidates  or  any  future  product  candidates,  remain  in  good  standing  with  regulatory  authorities  and  develop,  validate  and  maintain
commercially viable manufacturing processes that are compliant with current Good Manufacturing Practices, or cGMP;

our  ability  to  successfully  develop  a  commercial  and  competitive  strategy  and  thereafter  commercialize  our  product  candidates  or  any
future  product  candidates  in  the  United  States,  if  licensed  for  marketing,  reimbursement,  sale  and  distribution,  whether  alone  or  in
collaboration with others;

patient demand for our product candidates and any future product candidates, if licensed; and

our ability to establish and enforce intellectual property rights in and to our product candidates or any future product candidates.

Many of the factors listed above are beyond our control and could cause us to experience significant delays or prevent us from obtaining regulatory
approvals or commercialize our product candidates. Even if we are able to commercialize our product candidates, we may not achieve profitability soon
after  generating  product  sales,  if  ever.  If  we  are  unable  to  generate  sufficient  revenue  through  the  sale  of  our  product  candidates  or  any  future  product
candidates, we may be unable to continue operations without continued funding.

If  we  do  achieve  profitability,  we  may  not  be  able  to  sustain  or  increase  profitability  on  a  quarterly  or  annual  basis.  Additionally,  even  if  we
succeed in commercializing one or more of our product candidates, we will continue to incur substantial research and development and other expenditures
to research, develop and market additional product candidates. Our failure to become and remain profitable would decrease the value of our company and
could impair our ability to raise capital, maintain our research and development efforts, expand our business or continue our operations. A decline in the
value of our company also could cause you to lose all or part of your investment.

We may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. The
size of our future net losses will depend, in part, on the rate of future growth of our expenses and our ability to generate revenue. Our prior losses and
expected future losses have had and will continue to have an adverse effect on our stockholders’ equity and working capital.

We will require substantial additional financing to develop and commercialize our product candidates and implement our operating plans. If we
fail to obtain additional financing or cannot obtain financing at the levels we require, we may be delayed in our plans or unable to complete the
development and commercialization of our product candidates.

Our operations have consumed substantial amounts of cash since inception. We expect to continue to spend substantial amounts to continue the
preclinical and clinical development of our product candidates, including our planned DesCAARTesTM Trial, our initial in vitro studies and expected in
vivo studies of MuSK-CAART, and our planned studies for DSG3/1-CAART as well as research and development, preclinical studies and clinical trials for
FVIII-CAART  and  any  future  product  candidates,  to  seek  regulatory  approvals  for  our  product  candidates,  to  enable  commercial  production  of  our
products, if licensed, and to initiate and complete registration trials for multiple products. While we currently expect our existing cash and cash equivalents
to be sufficient to fund our operations through completion of Part A Dose Escalation of our planned Phase 1 clinical trial, we expect to require significant
additional financing to complete this Phase 1 trial, and any future clinical trials of DSG3-CAART and our other product candidates. Further, if licensed, we
will require significant additional amounts of cash to launch and commercialize our product candidates.

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As of December 31, 2019, we had approximately $136.2 million of cash and cash equivalents. On October 29, 2019, we completed an initial public
offering  of  our  common  stock  by  issuing  7,275,501  shares  of  our  common  stock  (including  475,501  shares  of  our  common  stock  pursuant  to  the
underwriters’  option  to  purchase  additional  shares  that  we  issued  in  November  2019),  at  $11.00  per  share,  for  gross  proceeds  of  $80.0  million,  or  net
proceeds of $71.0 million. Based on our current operating plan, we believe that the net proceeds from our IPO together with our existing cash and cash
equivalents will be sufficient to fund our operations through at least the third quarter of 2022. However, we have based this estimate on assumptions that
may prove to be wrong. Additionally, changing circumstances may cause us to consume capital significantly faster than we currently anticipate, and we
may need to spend more money than currently expected because of circumstances beyond our control. We may require substantial additional capital for the
further development and commercialization of our product candidates, including funding our internal manufacturing capabilities, and may need to raise
additional  funds  sooner  if  we  choose  to  expand  more  rapidly  than  we  presently  anticipate.  Because  the  length  of  time  and  activities  associated  with
development of our product candidates is highly uncertain, we are unable to estimate the actual funds we will require for development and any approved
marketing and commercialization activities. Our future funding requirements, both near- and long-term, will depend on many factors, including, but not
limited to:

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the initiation, progress, timing, costs and results of preclinical studies and clinical trials for our product candidates;

the clinical development plans we establish for these product candidates;

the number and characteristics of product candidates that we may develop or in-license;

the terms of any collaboration agreements we may choose to conclude;

the outcome, timing and cost of meeting regulatory requirements established by the FDA;

the cost of filing, prosecuting, defending and enforcing our patent claims and other intellectual property rights;

the cost of defending intellectual property disputes, including patent infringement actions brought by third parties against us or our product
candidates;

the effect of competing technological and market developments;

the costs of establishing and maintaining a supply chain for the development and manufacture of our product candidates;

the cost and timing of establishing, expanding and scaling manufacturing capabilities;

the  cost  of  maintaining  the  amount  patient  data  for  which  we  would  be  responsible  following  commercialization  of  one  or  more  of  our
product candidates; and

the  cost  of  establishing  sales,  marketing  and  distribution  capabilities  for  any  product  candidates  for  which  we  may  receive  regulatory
approval in regions where we choose to commercialize our products on our own.

We cannot be certain that additional funding will be available on acceptable terms, or at all. Until we are able to generate sufficient revenue to
finance our cash requirements, we will need to finance our future cash needs through a combination of public or private equity offerings, debt financings,
collaborations, strategic alliances, licensing arrangements and other marketing or distribution arrangements. If we are unable to raise additional capital in
sufficient amounts or on terms acceptable to us, we may have to significantly delay, scale back or discontinue our research and development initiatives. We
could be required to seek collaborators for our product candidates at an earlier stage than otherwise would be desirable or on terms that are less favorable
than might otherwise be available or relinquish or license on unfavorable terms our rights to our product candidates in markets where we otherwise would
seek to pursue development or commercialization ourselves.

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Future sales and issuances of our common stock or rights to purchase common stock, including pursuant to our equity incentive plans, could
result in additional dilution of the percentage ownership of our stockholders and could cause our stock price to fall.

We expect that significant additional capital may be needed in the future to continue our planned operations, including conducting clinical trials,
commercialization efforts, expanded research and development activities and costs associated with operating a public company. To raise capital, we may
sell common stock, convertible securities or other equity securities in one or more transactions at prices and in a manner we determine from time to time. If
we sell common stock, convertible securities or other equity securities, investors may be materially diluted by subsequent sales. Such sales may also result
in material dilution to our existing stockholders, and new investors could gain rights, preferences and privileges senior to the holders of our common stock.

Pursuant  to  our  equity  incentive  plans,  our  management  is  authorized  to  grant  stock  options  to  our  employees,  directors  and  consultants.
Additionally, the number of shares of our common stock reserved for issuance under the 2019 Stock Option and Incentive Plan automatically increased on
January 1, 2020 and will automatically increase each January 1 thereafter through and including January 1, 2029, by 4% of the total number of shares of
our capital stock outstanding on December 31 of the preceding calendar year, or a lesser number of shares determined by our board of directors. Unless our
board  of  directors  elects  not  to  increase  the  number  of  shares  available  for  future  grant  each  year,  our  stockholders  may  experience  additional  dilution,
which could cause our stock price to fall.

Any of the above events could significantly harm our business, prospects, financial condition and results of operations and cause the price of our

common stock to decline.

Risks Related to Our Intellectual Property

We  rely  heavily  on  certain  in-licensed  patent  and  other  intellectual  property  rights  in  connection  with  our  development  of  our  product
candidates and, if we fail to comply with our obligations under our existing and any future intellectual property licenses with third parties, we
could lose license rights that are important to our business.

Our ability to develop and commercialize our product candidates is heavily dependent on in-licenses to patent rights and other intellectual property
granted to us by third parties. For example, we depend heavily on our License Agreement with Penn and CHOP, pursuant to which we obtained (a) a non-
exclusive, non-sublicensable, worldwide research license to intellectual property controlled by Penn and CHOP to make, have made and use products in
two subfields of use, (b) effective as of October 2018, an exclusive, worldwide, royalty-bearing license, with the right to sublicense, under certain of such
intellectual property to make, use, sell, offer for sale and import products in the same two subfields of use, and (c) effective as of October 2018, a non-
exclusive, worldwide, royalty-bearing license, with limited rights to sublicense, under certain of Penn’s know-how to make, have made, use, sell, offer for
sale,  import  and  have  imported  products  in  the  same  two  subfields  of  use.  We  may  enter  into  additional  license  agreements  in  the  future.  Our  license
agreement  with  Penn  and  CHOP  imposes,  and  we  expect  that  future  license  agreements  will  impose,  various  diligence,  milestone  payment,  royalty,
insurance and other obligations on us. If we fail to comply with our obligations under these licenses, our licensors, including Penn and CHOP, may have the
right  to  terminate  these  license  agreements,  in  which  event  we  might  not  be  able  to  market  our  product  candidates.  Termination  of  any  of  our  license
agreements or reduction or elimination of our licensed rights may also result in our having to negotiate new or reinstated licenses with less favorable terms.

We may need to obtain additional licenses from third parties to advance our research or allow commercialization of our product candidates, and we
have done so from time to time. We may fail to obtain any of these licenses at a reasonable cost or on reasonable terms, if at all. In that event, we may be
required to expend significant time and resources to develop or license replacement technology. If we are unable to do so, we may be unable to develop or
commercialize the affected product candidates, which could harm our business significantly. We cannot provide any assurances that third-party patents do
not exist which might be enforced against our current product candidates or future products, resulting in either an injunction prohibiting our sales, or, with
respect to our sales, an obligation on our part to pay royalties and/or other forms of compensation to third parties.

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Furthermore, in many cases, we may not have the right to control the preparation, filing and prosecution of patent applications, or to maintain the
patents, covering technology that we in-license from third parties. For example, pursuant to our License Agreement with Penn and CHOP, Penn controls
such activities for the patent rights licensed to us under such agreement. Therefore, although we provide input to Penn and CHOP on these activities, we
cannot be certain that these patents will be prosecuted, maintained and enforced in a manner consistent with the best interests of our business. If our current
or future licensors or collaboration partners fail to obtain, maintain or protect any patents or patent applications licensed to us, our rights to such patents and
patent applications may be reduced or eliminated and our right to develop and commercialize any of our product candidates that are the subject of such
licensed rights could be adversely affected.

Disputes may arise between us and our current and future licensors regarding intellectual property subject to a license agreement, including those

related to:

•

•

•

•

•

•

the scope of rights granted under the License Agreement and other interpretation-related issues;

whether we have breached the License Agreement and whether any such breach is subject to a cure period;

whether  and  the  extent  to  which  our  technology  and  processes  infringe  on  intellectual  property  of  the  licensor  that  is  not  subject  to  the
licensing agreement;

our right to sublicense patent and other rights to third parties under collaborative development relationships;

our diligence obligations with respect to the use of the licensed technology in relation to our development and commercialization of our
product candidates, and what activities satisfy those diligence obligations; and

the ownership of inventions and know-how resulting from the joint creation or use of intellectual property by our licensors and us and our
partners.

Furthermore, disputes may arise between us and our current or future licensors regarding the ownership of intellectual property developed by us,
such  that  we  may  be  required  to  assign  or  otherwise  transfer  such  intellectual  property  to  such  licensor.  In  the  event  that  the  assigned  or  transferred
intellectual property is covered by an existing license agreement with such licensor we may be required to make additional royalty or milestone payments,
or both, to such licensor. If the assigned or transferred intellectual property is not covered by an existing license agreement, then we may be required to
enter into an additional license agreement to advance our research or allow commercialization of our product candidates, which may not be available on
commercially reasonable terms or at all.

If disputes over intellectual property that we have licensed, or license in the future, prevent or impair our ability to maintain our current licensing

arrangements on acceptable terms, we may be unable to successfully develop and commercialize the affected product candidates.

If  our  efforts  to  protect  the  proprietary  nature  of  the  intellectual  property  related  to  our  current  and  any  future  product  candidates  are  not
adequate, we may not be able to compete effectively in our market.

Our success depends in large part on our ability to obtain and maintain intellectual property protection in the United States and other countries with
respect to our product candidates. If we do not adequately protect or enforce our intellectual property rights, competitors may be able to erode or negate any
competitive advantage we may have, which could harm our business and ability to achieve profitability. To protect our proprietary position, we have in-
licensed  patent  rights  in  the  United  States  and  abroad  relating  to  the  product  candidates  that  are  important  to  our  business.  The  patent  application  and
approval  process  is  expensive,  complex  and  time-consuming.  Our  licensors  may  not  be  able  to  file  and  prosecute  all  necessary  or  desirable  patent
applications at a reasonable cost or in a timely manner.

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The patent position of biotechnology and pharmaceutical companies generally is highly uncertain. No consistent policy regarding the breadth of
claims  allowed  in  biotechnology  and  pharmaceutical  patents  has  emerged  to  date  in  the  United  States  or  in  many  foreign  jurisdictions.  In  addition,  the
determination of patent rights with respect to biological and pharmaceutical products commonly involves complex legal and factual questions, which has in
recent  years  been  the  subject  of  much  litigation.  As  a  result,  the  issuance,  scope,  validity,  enforceability  and  commercial  value  of  our  patent  rights  are
highly uncertain. Pending patent applications cannot be enforced against third parties practicing the technology claimed in such applications unless and
until a patent issues from such applications. Assuming the other requirements for patentability are met, currently, the first to file a patent application is
generally  entitled  to  the  patent.  However,  prior  to  March  16,  2013,  in  the  United  States,  the  first  to  invent  was  entitled  to  the  patent.  Publications  of
discoveries  in  the  scientific  literature  often  lag  behind  the  actual  discoveries,  and  patent  applications  in  the  United  States  and  other  jurisdictions  are
typically not published until 18 months after filing, or in some cases not at all. Therefore, we cannot be certain that our licensors were the first to make the
inventions  claimed  in  the  patents  or  pending  patent  applications  we  in-license,  or  that  our  licensors  were  the  first  to  file  for  patent  protection  of  such
inventions.

Moreover, because the issuance of a patent is not conclusive as to its inventorship, scope, validity or enforceability, the patents or pending patent
applications we in-license may be challenged in the courts or patent offices in the United States and abroad. For example, we may be subject to a third
party  preissuance  submission  of  prior  art  to  the  U.S.  Patent  and  Trademark  Office,  or  USPTO,  or  become  involved  in  post-grant  review  procedures,
derivation  proceedings,  reexaminations,  or  inter  partes  review  in  the  United  States,  or  oppositions  and  other  comparable  proceedings  in  foreign
jurisdictions, challenging our patent rights or the patent rights of others. An adverse determination in any such challenges may result in loss of exclusivity
or  in  patent  claims  being  narrowed,  invalidated  or  held  unenforceable,  in  whole  or  in  part,  which  could  limit  our  ability  to  stop  others  from  using  or
commercializing similar or identical technology and products, or limit the duration of the patent protection of our technology and product candidates. In
addition,  given  the  amount  of  time  required  for  the  development,  testing  and  regulatory  review  of  new  product  candidates,  patents  protecting  such
candidates might expire before or shortly after such candidates are commercialized.

Changes in either the patent laws or interpretation of the patent laws in the United States and other countries may diminish the value of the patents
we in-license or narrow the scope of our patent protection. In addition, the laws of foreign countries may not protect our rights to the same extent or in the
same  manner  as  the  laws  of  the  United  States.  For  example,  European  patent  law  is  more  restrictive  than  U.S.  patent  law  in  connection  with  the
patentability of methods of treatment of the human body.

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We cannot predict whether the patent applications we in-license currently being pursued will issue as patents, whether the claims of any patent that
has or may issue will provide us with a competitive advantage or prevent competitors from designing around the claims to develop competing technologies
in  a  non-infringing  manner,  or  whether  we  or  our  licensors  will  be  able  to  successfully  pursue  patent  applications  in  the  future  relating  to  our  current
product candidates or future products and product candidates. Moreover, the patent application and approval process is expensive and time-consuming. We
or our licensors may not be able to file and prosecute all necessary or desirable patent applications at a reasonable cost or in a timely manner. Furthermore,
we,  or  any  future  partners,  collaborators,  or  licensees,  may  fail  to  identify  patentable  aspects  of  inventions  made  in  the  course  of  development  and
commercialization  activities  before  it  is  too  late  to  obtain  patent  protection  on  them.  Therefore,  we  may  miss  potential  opportunities  to  seek  additional
patent protection.

It is possible that defects of form in the preparation or filing of patent applications may exist, or may arise in the future, for example with respect to
proper priority claims, inventorship, claim scope, or requests for patent term adjustments. If we fail to establish, maintain or protect such patents and other
intellectual property rights, such rights may be reduced or eliminated. If there are material defects in the form, preparation, prosecution or enforcement of
the  patents  or  patent  applications  we  in-license,  such  patents  may  be  invalid  and/or  unenforceable,  and  such  applications  may  never  result  in  valid,
enforceable patents. Any of these outcomes could impair our ability to prevent competition from third parties, which may have an adverse impact on our
business.

Even if the patent applications we in-license issue as patents, they may not issue in a form that will provide us with any meaningful protection,
prevent  competitors  from  competing  with  us  or  otherwise  provide  us  with  any  competitive  advantage.  Our  competitors  may  be  able  to  circumvent  our
patent rights by developing similar or alternative technologies or products in a non-infringing manner. Our competitors may also seek approval to market
their own products similar to or otherwise competitive with our product candidates. Alternatively, our competitors may seek to market generic versions of
any  approved  products  by  submitting  abbreviated  BLAs  to  the  FDA  during  which  process  they  may  claim  that  patents  licensed  by  us  are  invalid,
unenforceable or not infringed. In these circumstances, we may need to defend or assert our intellectual property rights, or both, including by filing lawsuits
alleging patent infringement. In any of these types of proceedings, a court or other agency with jurisdiction may find the patents we in-license invalid or
unenforceable, or that our competitors are competing in a non-infringing manner. Thus, even if we have in-licensed valid and enforceable patents, these
patents still may not provide protection against competing products or processes sufficient to achieve our business objectives. Any of the foregoing could
have a material adverse effect on our competitive position, business, financial conditions, results of operations, and prospects.

In the future, we likely will need to expand our patent portfolio to pursue patent coverage for new product candidates that we wish to develop. The
patent  prosecution  process  is  competitive,  and  other  companies,  some  which  may  have  greater  resources  than  we  do  in  this  area,  may  also  be  pursuing
intellectual property rights that we may consider necessary or attractive in order to develop and commercialize future product candidates.

We may not be able to protect our intellectual property rights throughout the world.

Filing,  prosecuting,  maintaining,  defending  and  enforcing  patents  on  our  product  candidates  in  all  countries  throughout  the  world  would  be
prohibitively expensive, and our intellectual property rights in some countries outside the United States could be less extensive than those in the United
States. The deadline to pursue protection in foreign jurisdictions for many of the patent families licensed under the License Agreement with Penn has not
yet expired. Prior to applicable deadlines, we and Penn will need to decide where to pursue protection, and we will not have the opportunity to pursue
protection unless we do so in applicable jurisdictions prior to the deadlines. Although our License Agreement grants us worldwide rights, there can be no
assurance that we will obtain or maintain patent rights in or outside the United States under any future license agreements. In addition, the laws of some
foreign countries do not protect intellectual property rights to the same extent as federal and state laws in the United States even in jurisdictions where we
and our licensors pursue patent protection. Consequently, we and our licensors may not be able to prevent third parties from practicing our inventions in all
countries outside the United States, even in jurisdictions where we and our licensors pursue patent protection, or from selling or importing products made
using our inventions in and into the United States or other jurisdictions. Competitors may use our technologies in jurisdictions where we and our licensors
have not pursued and obtained patent protection to develop their own products and, further, may export otherwise infringing products to territories where
we and our licensors have patent protection, but enforcement is not as strong as that in the United States. These products may compete with our

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product candidates and the patents we in-license or other intellectual property rights may not be effective or sufficient to prevent them from competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal
systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property
protection, particularly those relating to biotechnology products, which could make it difficult for us to stop the infringement of the patents we in-license or
marketing  of  competing  products  in  violation  of  our  proprietary  rights  generally.  Proceedings  to  enforce  our  patent  rights,  even  if  obtained,  in  foreign
jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, could put the patents we in-license at
risk of being invalidated or interpreted narrowly and the patent applications we in-license at risk of not issuing and could provoke third parties to assert
claims  against  us.  We  may  not  prevail  in  any  lawsuits  that  we  initiate,  and  the  damages  or  other  remedies  awarded,  if  any,  may  not  be  commercially
meaningful.  Accordingly,  our  efforts  to  enforce  our  intellectual  property  rights  around  the  world  may  be  inadequate  to  obtain  a  significant  commercial
advantage from the intellectual property that we develop or license.

We or our licensors may be subject to claims challenging the inventorship or ownership of the patents and other intellectual property that we
own or license.

We or our licensors may be subject to claims that former employees, collaborators or other third parties have an ownership interest in the patents
and intellectual property that we in-license or that we may own or in-license in the future. While it is our policy to require our employees and contractors
who may be involved in the development of intellectual property to execute agreements assigning such intellectual property to us, we may be unsuccessful
in executing such an agreement with each party who in fact develops intellectual property that we regard as our own or such assignments may not be self-
executing or may be breached. Our licensors may face similar obstacles. We or our licensors could be subject to ownership disputes arising, for example,
from conflicting obligations of employees, consultants or others who are involved in developing our product candidates. For example, our scientific co-
founders, Drs. Payne and Milone, are members of our scientific advisory board and are also employed by and subject to Penn’s intellectual property policy.
Litigation may be necessary to defend against any claims challenging inventorship or ownership. If we or our licensors fail in defending any such claims,
we  may  have  to  pay  monetary  damages  and  may  lose  valuable  intellectual  property  rights,  such  as  exclusive  ownership  of,  or  right  to  use,  intellectual
property, which could adversely impact our business, results of operations and financial condition.

Some  intellectual  property  which  we  have  in-licensed  was  discovered  through  government  funded  programs  and  thus  is  subject  to  federal
regulations such as “march-in” rights, certain reporting requirements, and a preference for U.S. industry. Compliance with such regulations
may limit our exclusive rights and limit our ability to contract with non-U.S. manufacturers.

Certain of the intellectual property rights we have licensed, including rights licensed to us by Penn relating to our DSG3-CAART and DSG3/1-
CAART  product  candidates,  was  generated  through  the  use  of  U.S.  government  funding  and  may  therefore  be  subject  to  certain  federal  laws  and
regulations.  As  a  result,  the  U.S.  government  has  certain  rights  to  intellectual  property  embodied  in  our  DSG3-CAART  and  DSG3/1-CAART  product
candidates and may have rights in future product candidates pursuant to the Bayh-Dole Act of 1980. These U.S. government rights in certain inventions
developed  under  a  government-funded  program  include  a  non-exclusive,  non-transferable,  irrevocable  worldwide  license  to  use  inventions  for  any
governmental purpose. In addition, the U.S. government has the right to require us to grant exclusive, partially exclusive, or non-exclusive licenses to any
of these inventions to a third party if it determines that: (i) adequate steps have not been taken to commercialize the invention; (ii) government action is
necessary to meet public health or safety needs; or (iii) government action is necessary to meet requirements for public use under federal regulations, also
referred to as “march-in rights”. The U.S. government also has the right to take title to these inventions if we, or the applicable licensor, such as Penn, fail
to  disclose  the  invention  to  the  government  and  fail  to  file  an  application  to  register  the  intellectual  property  within  specified  time  limits.  Intellectual
property generated under a government funded program is also subject to certain reporting requirements, compliance with which may require us or the
applicable licensor to expend substantial resources. In addition, the U.S. government requires that products embodying the subject invention or produced
through the use of the subject invention be manufactured substantially in the United States. The manufacturing preference requirement can be waived if the
owner of the intellectual property can show that reasonable but unsuccessful efforts have been made to grant licenses on similar terms to potential licensees
that would be likely to

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manufacture substantially in the United States or that under the circumstances domestic manufacture is not commercially feasible. This preference for U.S.
manufacturers may limit our ability to contract with non-U.S. product manufacturers for product candidates covered by such intellectual property.

We may become involved in lawsuits to protect or enforce our patent rights or other intellectual property rights, which could be expensive, time
consuming and unsuccessful.

Competitors  may  infringe,  misappropriate  or  otherwise  violate  patents,  trademarks,  copyrights  or  other  intellectual  property  that  we  own  or  in-
license.  To  counter  infringement,  misappropriation  or  other  unauthorized  use,  we  may  be  required  to  file  claims,  which  can  be  expensive  and  time
consuming and divert the time and attention of our management and scientific personnel. Any claims we assert against perceived violators could provoke
these  parties  to  assert  counterclaims  against  us  alleging  that  we  infringe,  misappropriate  or  otherwise  violate  their  intellectual  property,  in  addition  to
counterclaims asserting that the patents we in-license are invalid or unenforceable, or both. In any patent infringement proceeding, there is a risk that a
court will decide that a patent we in-license is invalid or unenforceable, in whole or in part, and that we do not have the right to stop the other party from
using the invention at issue. There is also a risk that, even if the validity of such patents is upheld, the court will construe the patent’s claims narrowly or
decide  that  we  do  not  have  the  right  to  stop  the  other  party  from  using  the  invention  at  issue  on  the  grounds  that  the  patent  claims  do  not  cover  the
invention. An adverse outcome in a litigation or proceeding involving the patents we in-license could limit our ability to assert the patent we in-license
against those parties or other competitors and may curtail or preclude our ability to exclude third parties from making and selling similar or competitive
products. Any of these occurrences could adversely affect our competitive business position, business prospects and financial condition.

Even if we establish infringement, misappropriation or another violation of our intellectual property rights, the court may decide not to grant an
injunction  against  the  offender  and  instead  award  only  monetary  damages,  which  may  or  may  not  be  an  adequate  remedy.  Furthermore,  because  of  the
substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could
be compromised by disclosure during litigation. There could also be public announcements of the results of hearings, motions or other interim proceedings
or developments. If securities analysts or investors perceive these results to be negative, it could have a material adverse effect on the price of our shares.
Moreover, there can be no assurance that we will have sufficient financial or other resources to file and pursue such claims, which typically last for years
before  they  are  concluded.  Even  if  we  ultimately  prevail  in  such  claims,  the  monetary  cost  of  such  litigation  and  the  diversion  of  the  attention  of  our
management  and  scientific  personnel  could  outweigh  any  benefit  we  receive  as  a  result  of  the  proceedings.  Any  of  the  foregoing  may  have  a  material
adverse effect on our business, financial condition, results of operations and prospects.

Changes in patent law in the United States and other jurisdictions could diminish the value of patents in general, thereby impairing our ability
to protect our product candidates.

Changes in either the patent laws or the interpretation of the patent laws in the United States or other jurisdictions could increase the uncertainties
and costs surrounding the prosecution of patent applications and the enforcement or defense of issued patents. On September 16, 2011, the Leahy-Smith
America Invents Act, or the Leahy-Smith Act, was signed into law. When implemented, the Leahy-Smith Act included several significant changes to U.S.
patent law that impacted how patent rights could be prosecuted, enforced and defended. In particular, the Leahy-Smith Act also included provisions that
switched  the  United  States  from  a  “first-to-invent”  system  to  a  “first-to-file”  system,  allowed  third-party  submission  of  prior  art  to  the  USPTO  during
patent prosecution and set forth additional procedures to attack the validity of a patent by the USPTO administered post grant proceedings. Under a first-to-
file system, assuming the other requirements for patentability are met, the first inventor to file a patent application generally will be entitled to the patent on
an invention regardless of whether another inventor had made the invention earlier. The USPTO developed new regulations and procedures governing the
administration of the Leahy-Smith Act, and many of the substantive changes to patent law associated with the Leahy-Smith Act, and in particular, the first
to file provisions, only became effective on March 16, 2013. It remains unclear what impact, if any, the Leahy-Smith Act will have on the operation of our
business.  However,  the  Leahy-Smith  Act  and  its  implementation  could  increase  the  uncertainties  and  costs  surrounding  the  prosecution  of  the  patent
applications  we  in-license  and  the  enforcement  or  defense  of  the  issued  patents  we  in-license,  all  of  which  could  have  a  material  adverse  effect  on  our
business.

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The  patent  positions  of  companies  engaged  in  the  development  and  commercialization  of  biologics  are  particularly  uncertain.  For  example,  the
Supreme Court of the United States issued its decision in Association for Molecular Pathology v. Myriad Genetics, Inc., or Myriad, a case involving patent
claims  held  by  Myriad  Genetics,  Inc.  relating  to  the  breast  cancer  susceptibility  genes  BRCA1  and  BRCA2.  Myriad  held  that  an  isolated  segment  of
naturally occurring DNA, such as the DNA constituting the BRCA1 and BRCA2 genes, is not patent-eligible subject matter, but that complementary DNA,
which  is  an  artificial  construct  that  may  be  created  from  RNA  transcripts  of  genes,  may  be  patent-eligible.  Thereafter,  the  USPTO  issued  a  guidance
memorandum instructing USPTO examiners on the ramifications of the Prometheus and Myriad rulings and apply the Myriad ruling to natural products
and principles including all naturally occurring nucleic acids. Certain claims of our in-licensed patent applications contain, and any future patents we may
obtain  may  contain,  claims  that  relate  to  specific  recombinant  DNA  sequences  that  are  naturally  occurring  at  least  in  part  and,  therefore,  could  be  the
subject of future challenges made by third parties.

We cannot assure you that our efforts to seek patent protection for one or more of our product candidates will not be negatively impacted by this
Supreme  Court  decision,  rulings  in  other  cases  or  changes  in  guidance  or  procedures  issued  by  the  USPTO.  We  cannot  fully  predict  what  impact  the
Supreme Court’s decisions in Myriad may have on the ability of life science companies to obtain or enforce patents relating to their products in the future.
These decisions, the guidance issued by the USPTO and rulings in other cases or changes in USPTO guidance or procedures could have a material adverse
effect on our existing patent rights and our ability to protect and enforce our intellectual property in the future.

If we are unable to protect the confidentiality of trade secrets, our business and competitive position would be harmed.

In  addition  to  the  protection  afforded  by  patents,  we  rely  on  trade  secret  protection  and  confidentiality  agreements  to  protect  certain
proprietary know-how that is not patentable or that we elect not to patent, processes for which patents are difficult to enforce, and any other elements of our
product  candidate  discovery  and  development  processes  that  involve  proprietary  know-how,  information  or  technology  that  is  not  covered  by  patents.
However, trade secrets can be difficult to protect and some courts inside and outside the United States are less willing or unwilling to protect trade secrets.
We seek to protect our proprietary technology and processes, in part, by entering into confidentiality agreements with our employees, consultants, scientific
advisors, and contractors. We cannot guarantee that we have entered into such agreements with each party that may have or has had access to our trade
secrets  or  proprietary  technology  and  processes.  We  also  seek  to  preserve  the  integrity  and  confidentiality  of  our  data  and  trade  secrets  by  maintaining
physical  security  of  our  premises  and  physical  and  electronic  security  of  our  information  technology  systems.  While  we  have  confidence  in  these
individuals, organizations and systems, agreements or security measures may be breached, and we may not have adequate remedies for any breach.

In addition, our trade secrets may otherwise become known or be independently discovered by competitors. Competitors and other third parties
could  infringe,  misappropriate  or  otherwise  violate  our  intellectual  property  rights,  design  around  our  protected  technology  or  develop  their  own
competitive  technologies  that  fall  outside  of  our  intellectual  property  rights.  If  any  of  our  trade  secrets  were  to  be  lawfully  obtained  or  independently
developed by a competitor or other third party, we would have no right to prevent them, or those to whom they communicate it, from using that technology
or  information  to  compete  with  us.  If  our  trade  secrets  are  not  adequately  protected  or  sufficient  to  provide  an  advantage  over  our  competitors,  our
competitive position could be adversely affected, as could our business. Additionally, if the steps taken to maintain our trade secrets are deemed inadequate,
we may have insufficient recourse against third parties for misappropriating our trade secrets.

We  may  become  subject  to  claims  that  we  are  infringing  certain  third-party  patents  or  other  third-party  intellectual  property  rights,  any  of
which may prevent or delay our development and commercialization efforts and have a material adverse effect on our business.

Our  commercial  success  depends  in  part  on  avoiding  infringing,  misappropriating  and  otherwise  violating  the  patents  and  other  intellectual
property and proprietary rights of third parties. There is a substantial amount of litigation, both within and outside the United States, involving patent and
other  intellectual  property  rights  in  the  biotechnology  and  pharmaceutical  industries,  including  patent  infringement  lawsuits,  and  administrative
proceedings such as interferences, inter partes  review  and  post  grant  review  proceedings  before  the  USPTO  and  opposition  proceedings  before  foreign
patent offices. Numerous U.S. and foreign issued patents and pending patent applications, which are owned or controlled by third parties, including our
competitors, exist in the fields in which we are pursuing product candidates. As the biotechnology and pharmaceutical industries expand and more patents

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are issued, the risk increases that our product candidates may be subject to claims of infringement of the patent rights of third parties.

Third  parties  may  assert  that  we  or  our  licensors  are  employing  their  proprietary  technology  without  authorization.  There  may  be  third-party
patents or patent applications with claims to materials, methods of manufacture or methods for treatment relating to our product candidates and, because
patent applications can take many years to issue, there may be currently pending third party patent applications which may later result in issued patents, in
each case that our product candidates, their manufacture or use may infringe or be alleged to infringe. We may fail to identify potentially relevant patents or
patent applications, incorrectly conclude that a patent is invalid or does not cover our activities, or incorrectly conclude that a patent application is unlikely
to issue in a form of relevance to our activities.

Parties making patent infringement claims against us may obtain injunctive or other equitable relief, which could effectively block our ability to
further develop and commercialize one or more of our product candidates. Defense of these claims, including demonstrating non-infringement, invalidity or
unenforceability of the respective patent rights in question, regardless of their merit, is time-consuming, would involve substantial litigation expense and
would be a substantial diversion of employee resources from our business. For example, in order to successfully challenge the validity of any U.S. patent in
federal court, we would need to overcome a presumption of validity. This is a high burden requiring us to present clear and convincing evidence as to the
invalidity of any such U.S. patent claim, and we can provide no assurance that a court of competent jurisdiction would invalidate the claims of any such
U.S. patent. We may not have sufficient resources to bring these actions to a successful conclusion. There could also be public announcements of the results
of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, it could have a
material adverse effect on the price of our shares.

In the event that a holder of any such patents seeks to enforce its patent rights against us with respect to one or more of our product candidates, and
our defenses against the infringement of such patent rights are unsuccessful, we may be precluded from commercializing our product candidates, even if
approved,  without  first  obtaining  a  license  to  some  or  all  of  these  patents,  which  may  not  be  available  on  commercially  reasonable  terms  or  at  all.
Moreover,  we  may  be  required  to  pay  significant  fees  and  royalties  to  secure  a  license  to  the  applicable  patents.  Such  a  license  may  only  be  non-
exclusive,  in  which  case  our  ability  to  stop  others  from  using  or  commercializing  technology  and  products  similar  or  identical  to  ours  may  be  limited.
Furthermore, we could be liable for damages to the holder of these patents, which may be significant and could include treble damages if we are found to
have willfully infringed such patents. In the event that a challenge to these patents were to be unsuccessful or we were to become subject to litigation or
unable  to  obtain  a  license  on  commercially  reasonable  terms  with  respect  to  these  patents,  it  could  harm  our  business,  financial  condition,  results  of
operations and prospects.

We  are  aware  of  third-party  issued  U.S.  patents  relating  to  the  lentiviral  vectors  which  may  be  used  in  the  manufacture  or  use  of  our  product
candidates. If these patent rights were enforced against us, we believe that we have defenses against any such action, including that these patents would not
be  infringed  by  our  product  candidates  and/or  that  these  patents  are  not  valid.  However,  if  these  patents  were  enforced  against  us  and  defenses  to  such
enforcement were unsuccessful, unless we obtain a license to these patents, which may not be available on commercially reasonable terms, or at all, we
could be liable for damages and precluded from commercializing any product candidates that were ultimately held to infringe these patents, which could
have a material adverse effect on our business, financial condition, results of operations and prospects.

Even in the absence of a finding of infringement, we may need or may choose to obtain licenses from third parties to advance our research or allow
commercialization of our product candidates. We may fail to obtain any of these licenses at a reasonable cost or on reasonable terms, or at all. In that event,
we would be unable to further develop and commercialize our product candidates. Claims that we have misappropriated the confidential information or
trade secrets of third parties could have a similar negative impact on our business. Any of the foregoing could materially adversely affect our business,
results of operations and financial condition.

Patent term may be inadequate to protect our competitive position on our product candidates for an adequate amount of time.

Given  the  amount  of  time  required  for  the  development,  testing  and  regulatory  review  of  new  product  candidates,  patents  protecting  such
candidates  might  expire  before  or  shortly  after  such  candidates  are  commercialized.  In  the  United  States,  the  Drug  Price  Competition  and  Patent  Term
Restoration Act of 1984 permits

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a  patent  term  extension  of  up  to  five  years  beyond  the  normal  expiration  of  the  patent,  which  is  limited  to  the  approved  indication  (or  any  additional
indications approved during the period of extension). However, a patent term extension cannot extend the remaining term of a patent beyond a total of 14
years  from  the  date  of  the  product’s  approval  by  the  FDA,  only  one  patent  applicable  to  an  approved  drug  is  eligible  for  the  extension,  and  only  those
claims  covering  the  approved  drug,  a  method  for  using  it  or  a  method  for  manufacturing  it  may  be  extended.  In  the  future,  if  and  when  our  product
candidates receive FDA approval, we plan to apply for patent term extensions on patents covering those product candidates in any jurisdiction where these
are available. However, the applicable authorities, including the FDA and the USPTO in the United States, and any equivalent regulatory authority in other
countries, may not agree with our assessment of whether such extensions are available, and may refuse to grant extensions to the patents we in-license, or
may grant more limited extensions than we request. Moreover, we may not receive an extension because of, for example, failing to apply within applicable
deadlines, failing to apply prior to expiration of relevant patents or otherwise failing to satisfy applicable requirements. If this occurs, our competitors may
be  able  to  take  advantage  of  our  investment  in  development  and  clinical  trials  by  referencing  our  clinical  and  preclinical  data  and  launch  their  product
earlier than might otherwise be the case.

We may be subject to claims asserting that our employees, consultants or advisors have wrongfully used or disclosed alleged trade secrets of
their current or former employers or claims asserting ownership of what we regard as our own intellectual property.

Certain  of  our  employees,  consultants  or  advisors  are  currently,  or  were  previously,  employed  at  universities  or  other  biotechnology  or
pharmaceutical companies, including our competitors or potential competitors. Although we try to ensure that our employees, consultants and advisors do
not use the proprietary information or know-how of others in their work for us, we may be subject to claims that these individuals or we have used or
disclosed intellectual property, including trade secrets or other proprietary information, of any such individual’s current or former employer. Litigation may
be  necessary  to  defend  against  these  claims.  If  we  fail  in  defending  any  such  claims,  in  addition  to  paying  monetary  damages,  we  may  lose  valuable
intellectual property rights or personnel. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a
distraction to management. Our licensors may face similar risks, which could have an adverse impact on intellectual property that is licensed to us.

Intellectual property rights do not necessarily address all potential threats.

The degree of future protection afforded by our intellectual property rights is uncertain because intellectual property rights have limitations and

may not adequately protect our business or permit us to maintain our competitive advantage. For example:

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others may be able to make products that are similar to our product candidates or utilize similar cell therapy technology but that are not
covered by the claims of our current or future patent portfolio;

we, or our current or future licensors or collaborators, might not have been the first to make the inventions covered by the issued patent or
pending patent application that we license now or that we may license or own in the future;

we, or our current or future licensors or collaborators, might not have been the first to file patent applications covering certain of our or
their inventions;

others may independently develop similar or alternative technologies or duplicate any of our technologies without infringing our licensed
intellectual property rights;

it is possible that our current or future licensed patent applications will not lead to issued patents;

issued patents that we hold rights to may be held invalid or unenforceable, including as a result of legal challenges by our competitors or
other third parties;

our competitors or other third parties might conduct research and development activities in countries where we do not have patent rights
and then use the information learned from such activities to develop competitive products for sale in our major commercial markets;

we may not develop additional proprietary technologies that are patentable;

the patents of others may harm our business;

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we may choose not to file a patent application in order to maintain certain trade secrets or know-how, and a third party may subsequently
file a patent application covering such intellectual property; and

third-party patents may issue with claims covering our activities; we may have infringement liability exposure arising from such patents.

Should any of these events occur, they could have a material adverse effect on our business, financial condition, results of operations and prospects.

Risks Related to Our Reliance on Third Parties

We are reliant on a research services agreement with Penn for our nonclinical research and development activities and current manufacturing
activities.

If Penn and its affiliated entities were to fail to perform their obligations in accordance with the terms of the Services Agreement or terminate the
Services Agreement with little notice, we may have difficulty continuing our normal business operations and our business prospects, financial condition
and  results  of  operations  could  be  harmed.  In  addition,  the  termination  of  our  relationship  with  Penn  and  the  Services  Agreement  and  any  delay  in
appointing or finding a suitable replacement provider, if one exists, could make it difficult for us to operate our business for that period. Moreover, we will
be reliant on Penn to assist us with any necessary technology transfer. Any delays or inadequacies in such technology transfer, or disputes regarding the
scope of such technology transfer, could delay our operations, including our clinical trials, require us to expend additional resources and otherwise have an
adverse effect on our business.

Additionally, over time we will need to transition from receiving the services that Penn currently provides to performing such services internally.
The Services Agreement is scheduled to expire on the later of October 19, 2021 or completion of all research and development projects, and unless the
Services Agreement is amended, Penn will not be obligated to provide any further services under the Services Agreement after that time. In addition, Penn
has the right to terminate the Services Agreement in whole at any time with 90 days’ notice and to terminate any research and development project being
performed  under  the  Services  Agreement  if  the  Penn  service  provider  appointed  to  lead  such  project  is  unavailable  and  Penn  is  unavailable  to  find  a
replacement  within  60  days  for  such  service  provider.  Penn  also  has  the  right  to  terminate  certain  manufacturing  services  being  performed  under  the
Services Agreement with 180 days’ written notice. From time to time, we may enter into further addenda to the Services Agreement that provide Penn with
the  right  to  terminate  such  addenda  with  limited  notice  periods.  If  we  do  not  have  adequate  personnel  and  capabilities  at  the  time  that  we  assume
responsibilities for such services, we may not be successful in effectively or efficiently transitioning these services from Penn, which could disrupt our
business and have a material adverse effect on our financial condition and results of operations. Further, we will incur costs relating to establishing our own
financial, administrative, information technology and other support functions as well as running and maintaining such functions on a going-forward basis.
In addition, the process of establishing such functions may distract our management from focusing on business and strategic opportunities and could result
in disruptions to our business. Even if we are able to successfully transition these services, they may be more expensive or less efficient than the services
we are receiving from Penn during the transition period.

We will rely on third parties, including Penn, to conduct our clinical trials. If these third parties do not successfully carry out their contractual
duties or meet expected deadlines, we may not be able to obtain regulatory approval of or commercialize our product candidates.

We  depend  and  will  continue  to  depend  upon  third  parties,  including  independent  investigators  and  collaborators,  such  as  universities,  medical
institutions, CROs and strategic partners, to conduct our preclinical studies and clinical trials under agreements with us. Specifically, we depend on our
collaborator, Penn, pursuant to the terms of the Services Agreement, to enroll patients and conduct the DesCAARTesTM Trial at the first clinical trial site,
to be located at Penn, in a timely and appropriate manner. If Penn does not conduct the trial on the timeline we expect or otherwise fails to support the trial,
our  clinical  trial  results  could  be  significantly  delayed,  thereby  adversely  impacting  our  leadership  position  in  the  CAAR  T  industry  and  our  ability  to
progress  additional  product  candidates.  Further,  although  we  intend  to  transition  our  manufacturing  needs  to  a  CDMO  and  eventually  secure  our  own
clinical manufacturing facility, we must currently rely on Penn to manufacture supplies and process our product

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candidates. As we open additional clinical trial sites, we expect to have to negotiate budgets and contracts with CROs and study sites, which may result in
delays to our development timelines and increased costs.

We will rely heavily on these third parties, including Penn, to conduct our preclinical studies and clinical trials, and as a result, will have limited
control over the clinical investigators and limited visibility into their day-to-day activities, including with respect to their compliance with the approved
clinical protocol. Nevertheless, we are responsible for ensuring that each of our trials is conducted in accordance with applicable protocol, legal, regulatory
and scientific standards, and our reliance on third parties does not relieve us of our regulatory responsibilities. We and these third parties are required to
comply with Good Clinical Practices, or GCPs, which are regulations and guidelines enforced by the FDA for product candidates in clinical development.
Regulatory authorities enforce these GCPs through periodic inspections of trial sponsors, principal investigators and trial sites. If we or any of these third
parties  fail  to  comply  with  applicable  GCP  requirements,  the  clinical  data  generated  in  our  clinical  trials  may  be  deemed  unreliable  and  the  FDA  may
require  us  to  perform  additional  clinical  trials  before  approving  our  marketing  applications.  We  cannot  provide  assurance  that,  upon  inspection,  such
regulatory authorities will not determine that some or all of our clinical trials do not fully comply with the GCP requirements. For any violations of laws
and regulations during the conduct of our clinical trials, we could be subject to untitled and warning letters or enforcement action that may include civil
penalties up to and including criminal prosecution. In addition, our clinical trials must be conducted with biologic product produced under cGMPs and will
require  a  large  number  of  test  patients.  We  also  are  required  to  register  ongoing  clinical  trials  and  post  the  results  of  completed  clinical  trials  on  a
government-sponsored database within certain timeframes. Failure to do so can result in fines, adverse publicity and civil and criminal sanctions.

If  we  or  these  third  parties  do  not  successfully  carry  out  their  contractual  duties,  meet  expected  deadlines,  or  conduct  our  clinical  trials  in
accordance with regulatory requirements or our stated protocols, we will not be able to obtain, or may be delayed in obtaining, marketing approvals for any
product candidates we may develop and will not be able to, or may be delayed in our efforts to, successfully commercialize our medicines. Our failure or
the  failure  of  these  third  parties  to  comply  with  applicable  regulatory  requirements  or  our  stated  protocols  could  also  subject  us  to  enforcement  action.
Moreover,  our  business  may  be  implicated  if  any  of  these  third  parties  violates  federal  or  state  fraud  and  abuse  or  false  claims  laws  and  regulations  or
healthcare privacy and security laws.

Any third parties conducting our clinical trials will not be our employees and, except for remedies available to us under our agreements with such
third  parties,  we  cannot  control  whether  or  not  they  devote  sufficient  time  and  resources  to  our  ongoing  preclinical  and  clinical  programs.  These  third
parties may also have relationships with other commercial entities, including our competitors, for whom they may also be conducting clinical studies or
other drug development activities, which could affect their performance on our behalf. If these third parties do not successfully carry out their contractual
duties or obligations or meet expected deadlines, if they need to be replaced or if the quality or accuracy of the clinical data they obtain is compromised due
to the failure to adhere to our clinical protocols or regulatory requirements or for other reasons, our clinical trials may be extended, delayed or terminated
and we may not be able to complete development of, obtain regulatory approval of or successfully commercialize our product candidates. As a result, our
financial results and the commercial prospects for our product candidates would be harmed, our costs could increase and our ability to generate revenue
could be delayed.

If any of our relationships with trial sites, or any CRO that we may use in the future, terminates, we may not be able to enter into arrangements
with alternative trial sites or CROs or do so on commercially reasonable terms. Switching or adding third parties to conduct our clinical trials involves
substantial cost and requires extensive management time and focus. In addition, there is often a natural transition period when a new third party commences
work.  As  a  result,  delays  may  occur,  which  can  materially  impact  our  ability  to  meet  our  desired  clinical  development  timelines.  Though  we  carefully
manage our relationships with our CROs, there can be no assurance that we will not encounter similar challenges or delays in the future or that these delays
or challenges will not have a material adverse impact on our business, financial condition and prospects.

We also expect to rely on other third parties to store and distribute drug supplies for our clinical trials. Any performance failure on the part of our
distributors could delay clinical development or marketing approval of any product candidates we may develop or commercialization of our medicines,
producing additional losses and depriving us of potential product revenue.

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We intend to rely on third parties to manufacture our clinical product supplies, and we may have to rely on third parties to produce and process
our product candidates, if licensed.

Although we may eventually secure our own clinical manufacturing facility for any late phase clinical development that we undertake, we currently
rely on Penn to supply raw materials and other important components that are used to manufacture our product candidates and intend in the future to rely
on  CDMOs.  In  the  case  of  any  manufacturing  performed  for  us  by  Penn,  the  services  performed  for  us  risk  being  delayed  because  of  the  competing
priorities that Penn has for utilization of its manufacturing resources and any capacity issues that thereby arise.

We do not yet have sufficient information to reliably estimate the cost of the manufacturing and processing of our product candidates in clinical
quantity or commercial quantity, and the actual cost to manufacture and process our product candidates could ultimately materially and adversely affect the
commercial viability of our product candidates. As a result, we may never be able to develop a commercially viable product.

In addition, our anticipated reliance on a limited number of third-party manufacturers exposes us to the following risks:

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We may be unable to identify manufacturers on acceptable terms or at all because the number of potential manufacturers is limited and the
FDA may have questions regarding any replacement contractor. This may require new testing and regulatory interactions. In addition, a
new manufacturer would have to be educated in, or develop substantially equivalent processes for, production of our products after receipt
of FDA questions, if any.

Our  third-party  manufacturers  might  be  unable  to  timely  formulate  and  manufacture  our  product  or  produce  the  quantity  and  quality
required to meet our clinical and commercial needs, if any.

Contract manufacturers may not be able to execute our manufacturing procedures appropriately.

Any contract manufacturers that we engage may not perform as agreed or may not remain in the contract manufacturing business for the
time required to supply our clinical trials or to successfully produce, store and distribute our product candidates.

Manufacturers  are  subject  to  ongoing  periodic  unannounced  inspection  by  the  FDA  and  corresponding  state  agencies  to  ensure  strict
compliance with cGMP and other government regulations. We do not have control over third-party manufacturers’ compliance with these
regulations and standards.

We may not own, or may have to share, the intellectual property rights to any improvements made by our third-party manufacturers in the
manufacturing process for our product candidates.

Our third-party manufacturers could breach or terminate their agreement with us.

Furthermore,  all  of  our  contract  manufacturers  are  engaged  with  other  companies  to  supply  and/or  manufacture  materials  or  products  for  such
companies, which exposes our manufacturers to regulatory risks related to the production of such materials and products. As a result, failure to meet the
regulatory  requirements  for  the  production  of  those  materials  and  products  may  affect  the  regulatory  clearance  of  our  contract  manufacturers’  facilities
generally. If the FDA does not approve these facilities for the manufacture of our product candidates or if any agency withdraws its approval in the future,
we may need to find alternative manufacturing facilities, which would negatively impact our ability to develop, obtain regulatory approval for or market
our product candidates, if licensed.

Our contract manufacturers would also be subject to the same risks we face in developing our own manufacturing capabilities, as described above.
Each  of  these  risks  could  delay  our  clinical  trials,  the  approval,  if  any  of  our  product  candidates  by  the  FDA  or  the  commercialization  of  our  product
candidates  or  result  in  higher  costs  or  deprive  us  of  potential  product  revenue.  In  addition,  we  will  rely  on  third  parties  to  perform  release  tests  on  our
product candidates prior to delivery to patients. If these tests are not appropriately done and test data are not reliable, patients could be put at risk of serious
harm.

For more information, see “Risk Factors—Risks Related to Manufacturing and Supply”.

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We may form or seek strategic alliances or enter into additional licensing arrangements in the future, and we may not realize the benefits of
such alliances or licensing arrangements.

We may form or seek strategic alliances, create joint ventures or collaborations or enter into additional licensing arrangements with third parties
that we believe will complement or augment our development and commercialization efforts with respect to our product candidates and any future product
candidates  that  we  may  develop.  Any  of  these  relationships  may  require  us  to  incur  non-recurring  and  other  charges,  increase  our  near  and  long-term
expenditures, issue securities that dilute our existing stockholders or disrupt our management and business. In addition, we face significant competition in
seeking appropriate strategic partners and the negotiation process is time-consuming and complex. Moreover, we may not be successful in our efforts to
establish a strategic partnership or other alternative arrangements for our product candidates because they may be deemed to be at too early of a stage of
development for collaborative effort and third parties may not view our product candidates as having the requisite potential to demonstrate safety, potency
and  purity.  Any  delays  in  entering  into  new  strategic  partnership  agreements  related  to  our  product  candidates  could  delay  the  development  and
commercialization of our product candidates in certain geographies for certain indications, which would harm our business prospects, financial condition
and results of operations.

If we license products or businesses, we may not be able to realize the benefit of such transactions if we are unable to successfully integrate them
with  our  existing  operations  and  company  culture.  For  instance,  our  License  Agreement  with  Penn  and  CHOP  requires  significant  research  and
development  commitments  that  may  not  result  in  the  development  and  commercialization  of  our  product  candidates,  including  DSG3-CAART  and  our
other product candidates. We cannot be certain that, following a strategic transaction or license, we will achieve the results, revenue or specific net income
that justifies such transaction.

We  may  not  realize  the  benefits  of  acquired  assets  or  other  strategic  transactions,  including  any  transactions  whereby  we  acquire  or  license
manufacturing and other advanced technologies.

In August 2018, we entered into a License Agreement with Penn and the Children’s Hospital of Philadelphia, or CHOP, which was amended and
restated in July 2019, or the License Agreement, pursuant to which we were granted licenses to certain patent rights for the research and development of
products,  as  well  as  an  exclusive  license  under  those  same  patent  rights  to  make,  use,  sell  and  import  such  products,  in  the  autoimmune  disease  and
alloimmune response subfields, in each case, for the treatment of humans.

We  actively  evaluate  various  strategic  transactions  on  an  ongoing  basis.  We  may  acquire  other  businesses,  products  or  technologies  as  well  as
pursue joint ventures or investments in complementary businesses. The success of our strategic transactions, including the License Agreement, and any
future strategic transactions depends on the risks and uncertainties involved including:

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unanticipated liabilities related to acquired companies or joint ventures;

difficulties integrating acquired personnel, technologies and operations into our existing business;

retention of key employees;

diversion of management time and focus from operating our business to management of strategic alliances or joint ventures or acquisition
integration challenges;

increases in our expenses and reductions in our cash available for operations and other uses;

disruption in our relationships with collaborators or suppliers as a result of such a transaction; and

possible write-offs or impairment charges relating to acquired businesses or joint ventures.

If  any  of  these  risks  or  uncertainties  occur,  we  may  not  realize  the  anticipated  benefit  of  any  acquisition  or  strategic  transaction.  Additionally,
foreign  acquisitions  and  joint  ventures  are  subject  to  additional  risks,  including  those  related  to  integration  of  operations  across  different  cultures  and
languages, currency risks, potentially adverse tax consequences of overseas operations and the particular economic, political and regulatory risks associated
with specific countries.

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Future acquisitions or dispositions could result in potentially dilutive issuances of our equity securities, the incurrence of debt, contingent liabilities

or amortization expenses or write-offs of goodwill, any of which could harm our financial condition.

Risks Related to Manufacturing and Supply

We currently rely upon Penn for our manufacturing needs, and we intend to rely on other third parties for our future manufacturing needs
prior to establishing our own manufacturing facility.

We are currently reliant upon Penn for our cell product manufacturing for our lead product candidate, DSG3-CAART. In parallel with initiating our
first clinical trial, we plan to establish a relationship with a CDMO to help secure the manufacturing supply chain for future product candidates. We will
need to develop relationships with suppliers, increase the scale of production and demonstrate comparability of the material produced at these facilities to
the material that was previously produced. Transferring manufacturing processes and know-how is complex and involves review and incorporation of both
documented and undocumented processes that may have evolved over time.

In addition, transferring production to different facilities may require utilization of new or different processes to meet the specific requirements of a
given facility. We would expect additional comparability work will also need to be conducted to support the transfer of certain manufacturing processes and
process improvements. We cannot be certain that all relevant know-how and data has been adequately incorporated into the manufacturing process until the
completion of studies (and the related evaluations) intended to demonstrate the comparability of material previously produced with that generated by any
CDMO that we engage for our manufacturing needs. If we are not able to successfully transfer and produce comparable product candidates, our ability to
further develop and manufacture our product candidates may be negatively impacted.

We plan to eventually establish our own manufacturing facility. While the addition of our own manufacturing facility would provide us with future
flexibility within our manufacturing network, we still may need to identify additional CDMOs for continued production of supply for some or all of our
product candidates. Given the nature of our manufacturing processes, the number of CDMOs who possess the requisite skill and capability to manufacture
our CAAR T cell immunotherapy product candidates is limited.

Further, we may not be able to achieve clinical manufacturing and cell processing through Penn on a timely basis, on our own or at any future
CDMO. While our current manufacturing process is based off the validated process developed at Penn for CD19 CAR T, or CART19, we have limited
experience as an organization in managing the CAAR T engineering process. Finally, because clinical manufacturing and cell processing is highly complex,
we cannot be sure that the manufacturing processes employed by Penn, any CDMO that we engage in the future, or by us at a manufacturing facility that
we establish will consistently result in T cells that will be safe and effective.

If we are to operate our own manufacturing facility, significant resources will be required and we may fail to successfully operate our facility,
which could adversely affect our clinical trials and the commercial viability of our product candidates.

If we establish our own manufacturing facility, our operations will be subject to review and oversight by the FDA and the FDA could object to our
use of our manufacturing facility. We must first receive approval from the FDA prior to licensure to manufacture our product candidates, which we may
never obtain. Even if licensed, we would be subject to ongoing periodic unannounced inspection by the FDA and corresponding state agencies to ensure
strict compliance with cGMPs and other government regulations. Our license to manufacture product candidates will be subject to continued regulatory
review.

Our cost of goods development is at an early stage. The actual cost to manufacture and process our product candidates could be greater than we

expect and could materially and adversely affect the commercial viability of our product candidates.

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The manufacture of biopharmaceutical products is complex and requires significant expertise, and can be impacted by resource constraints,
labor disputes and workforce limitations.

The  manufacture  of  biopharmaceutical  products  is  complex  and  requires  significant  expertise,  including  the  development  of  advanced
manufacturing techniques and process controls. Manufacturers of cell therapy products often encounter difficulties in production, particularly in scaling out
and validating initial production and ensuring the absence of contamination. These problems include difficulties with production costs and yields, quality
control,  including  stability  of  the  product,  quality  assurance  testing,  operator  error,  shortages  of  qualified  personnel,  as  well  as  compliance  with  strictly
enforced federal, state and foreign regulations. Furthermore, if contaminants are discovered in our supply of product candidates or in the manufacturing
facilities  upon  which  we  currently  or  will  rely,  such  manufacturing  facilities  may  need  to  be  closed  for  an  extended  period  of  time  to  investigate  and
remedy the contamination. We cannot assure you that any stability or other issues relating to the manufacture of our product candidates, whether by Penn,
by a third-party CDMO, or at any manufacturing facility that we may establish, will not occur in the future.

Penn, third-party CDMOs that we engage or we may fail to manage the logistics of storing and shipping our product candidates. Storage failures
and shipment delays and problems caused by us, our vendors or other factors not in our control, such as weather, could result in loss of usable product or
prevent or delay the delivery of product candidates to patients.

Penn,  third-party  CDMOs  that  we  engage,  or  we  may  also  experience  manufacturing  difficulties  due  to  resource  constraints,  labor  disputes  or
workforce limitations arising from the expanding need for manufacturing in the cell therapy field and the limited number of training programs for technical
staff. If we were to encounter any of these difficulties, our ability to provide our product candidates to patients would be jeopardized.

We  are  dependent  upon  the  availability  of  specialty  raw  materials  and  the  production  capabilities  of  small  manufacturers  to  source  the
components of our product candidates.

Our  product  candidates  require  many  specialty  raw  materials,  some  of  which  are  manufactured  by  small  companies  with  limited  resources  and
experience to support a commercial product, and the suppliers may not be able to deliver raw materials to our specifications. In addition, those suppliers
generally  do  not  have  the  capacity  to  support  commercial  products  manufactured  under  cGMP  by  biopharmaceutical  firms.  The  suppliers  may  be  ill-
equipped to support our needs, especially in non-routine circumstances like an FDA inspection or medical crisis, such as widespread contamination. We
also do not have contracts with many of these suppliers, and we may not be able to contract with them on acceptable terms or at all. Accordingly, we may
experience delays in receiving key raw materials to support clinical or commercial manufacturing.

In  addition,  some  raw  materials  are  currently  available  from  a  single  supplier,  or  a  small  number  of  suppliers.  We  cannot  be  sure  that  these
suppliers will remain in business or that they will not be purchased by one of our competitors or another company that is not interested in continuing to
produce these materials for our intended purpose. In addition, the lead time needed to establish a relationship with a new supplier can be lengthy, and we
may experience delays in meeting demand in the event we must switch to a new supplier. The time and effort to qualify a new supplier could result in
additional costs, diversion of resources or reduced manufacturing yields, any of which would negatively impact our operating results. Further, we may be
unable to enter into agreements with a new supplier on commercially reasonable terms, which could have a material adverse impact on our business.

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Our  product  candidates  are  uniquely  manufactured.  If  we,  Penn  or  any  of  our  third-party  manufacturers  encounter  difficulties  in
manufacturing our product candidates, our ability to provide supply of our product candidates for clinical trials or, if licensed, for commercial
sale, could be delayed or stopped, or we may be unable to maintain a commercially viable cost structure.

The  manufacturing  process  used  to  produce  our  product  candidates  is  complex  and  novel  and  it  has  not  yet  been  validated  for  commercial
production. Among the complex processes used in the manufacture of our product candidates is the manufacture of the lentiviral delivery vector used to
deliver the applicable CAAR gene into the T cells. For example, the manufacture of our product candidates includes harvesting white blood cells from each
patient,  stimulating  certain  T  cells  from  the  white  blood  cells  and  thereby  causing  them  to  activate  and  proliferate,  combining  patient  T  cells  with  our
lentiviral delivery vector through a process known as transduction, expanding the transduced T cells to obtain the desired dose, and ultimately infusing the
modified  T  cells  back  into  the  patient’s  body.  Notably,  the  manufacture  of  both  DSG3/1-CAART  and  FVIII-CAART  will  likely  involve  particularly
complex processes due to the need to deliver large transgenes in a vector delivery system with limited capacity. Because of these complexities, the cost to
manufacture  our  product  candidates  is  higher  than  traditional  small  molecule  chemical  compounds  and  monoclonal  antibodies,  and  the  manufacturing
process is less reliable and is more difficult to reproduce. Furthermore, our manufacturing process development and scale-up is at an early stage. The actual
cost to manufacture and process our product candidates could be greater than we expect and could materially and adversely affect the commercial viability
of our product candidates.

Our  manufacturing  process  may  be  susceptible  to  logistical  issues  associated  with  the  collection  of  white  blood  cells  from  patients’  blood,
variability  in  the  quality  of  white  blood  cells  collected  from  patients’  blood,  procurement  of  lentiviral  vectors  and  shipment  to  the  product  candidate
manufacturing  site  as  well  as  shipment  of  the  final  product  to  clinical  centers,  manufacturing  issues  associated  with  interruptions  in  the  manufacturing
process,  contamination,  concentration  and  purity  of  batches  of  lentiviral  vectors,  equipment  or  reagent  failure,  improper  installation  or  operation  of
equipment, vendor or operator error, inconsistency in cell growth, and variability in product characteristics due to patient-to-patient variability. Even minor
deviations from normal manufacturing processes could result in reduced production yields, lot failures, product defects, product recalls, product liability
claims and other supply disruptions. If microbial, viral, or other contaminations are discovered in our product candidates or in the manufacturing facilities
in which our product candidates are made, production at such manufacturing facilities may be interrupted for an extended period of time to investigate and
remedy  the  contamination.  Further,  as  product  candidates  are  developed  through  preclinical  studies  to  late-stage  clinical  trials  toward  approval  and
commercialization, it is common that various aspects of the development program, such as manufacturing methods, are altered along the way in an effort to
optimize  processes  and  results.  Penn  has  informed  us  that  it  will  be  unable  provide  clinical  supply  for  any  late-phase  clinical  trials  of  our  product
candidates that we may conduct. Therefore, we will need to enter into new agreements with CDMOs to produce clinical supply of our product candidates
for late-phase clinical trials. We cannot guarantee that we will be able to enter into such agreements on commercially acceptable terms, if at all. We will
need to transfer the technology to manufacture our product candidates to these CDMOs, and these CDMOs may decide or be required to adopt different
manufacturing protocols or processes, which may require us to amend any ongoing or proposed clinical trial protocols or perform additional preclinical
studies to demonstrate the comparability of any such new manufacturing protocols or processes. We cannot provide any assurance that Penn will provide
adequate support to efficiently and effectively transfer the technology or that disputes will not arise between us and Penn regarding the necessary scope of
technology transfer, that the technology transfer will be successful, or that any CDMO will be successful in producing our product candidates in sufficient
quantities or of acceptable quality, if at all. Such changes carry the risk that they will not achieve these intended objectives, and any of these changes could
cause our product candidates to perform differently and affect the results of planned clinical trials or other future clinical trials.

Although we continue to optimize our manufacturing process for our product candidates, doing so is a difficult and uncertain task, and there are
risks  associated  with  scaling  to  the  level  required  for  advanced  clinical  trials  or  commercialization,  including,  among  others,  cost  overruns,  potential
problems  with  process  scale-up,  process  reproducibility,  stability  issues,  lot  consistency  and  timely  availability  of  reagents  and/or  raw  materials.  We
ultimately may not be successful in transferring our production system from our contract manufacturer to any manufacturing facilities we may establish
ourselves, or our contract manufacturer may not have the necessary capabilities to complete the implementation and development process. If we are unable
to adequately validate or scale-up the manufacturing process for our product candidates with our current manufacturer, we will need to transfer to another
manufacturer  and  complete  the  manufacturing  validation  process,  which  can  be  lengthy.  If  we  are  able  to  adequately  validate  and  scale-up  the
manufacturing  process  for  our  product  candidates  with  a  contract  manufacturer,  we  will  still  need  to  negotiate  with  such  contract  manufacturer  an
agreement for commercial supply and it is not certain we will be able to come to agreement on terms acceptable to us. As a result, we may ultimately be
unable to reduce the cost of goods for our product candidates to levels that will allow for an attractive return on investment if and when those product
candidates are commercialized.

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The manufacturing process for any products that we may develop is subject to the FDA approval process, and we will need to contract with
manufacturers who can meet all applicable FDA requirements on an ongoing basis.

The  manufacturing  process  for  any  products  that  we  may  develop  is  subject  to  the  FDA  approval  process,  and  we  will  need  to  contract  with
manufacturers  who  can  meet  all  applicable  FDA  requirements  on  an  ongoing  basis.  If  we  or  our  CDMOs  are  unable  to  reliably  produce  products  to
specifications acceptable to the FDA, we may not obtain or maintain the approvals we need to commercialize such products. Even if we obtain regulatory
approval  for  any  of  our  product  candidates,  there  is  no  assurance  that  either  we  or  our  CDMOs  will  be  able  to  manufacture  the  approved  product  in
accordance with requirements from the FDA, to produce it in sufficient quantities to meet the requirements for the potential launch of the product, or to
meet potential future demand. Any of these challenges could delay completion of clinical trials, require bridging clinical trials or the repetition of one or
more clinical trials, increase clinical trial costs, result in sanctions being imposed on us, including clinical holds, fines, injunctions, civil penalties, delays,
suspension or withdrawal of approvals, license revocation, suspension of production or recalls of the product candidates or marketed biologics, operating
restriction and criminal prosecutions, delay approval of our product candidates, impair commercialization efforts, increase our cost of goods, and have an
adverse effect on our business, financial condition, results of operations and growth prospects. Our future success depends on our ability to manufacture
our products, if licensed, on a timely basis with acceptable manufacturing costs, while at the same time maintaining good quality control and complying
with applicable regulatory requirements, and an inability to do so could have a material adverse effect on our business, financial condition, and results of
operations. In addition, we could incur higher manufacturing costs if manufacturing processes or standards change, and we could need to replace, modify,
design, or build and install equipment, all of which would require additional capital expenditures. Specifically, because our product candidates may have a
higher cost of goods than conventional therapies, the risk that coverage and reimbursement rates may be inadequate for us to achieve profitability may be
greater.

The manufacture of viral vectors is complex and variable, and there are a limited number of manufacturers able to supply us with viral vectors.

Our DSG3-CAART and MuSK-CAART product candidates utilize a lentiviral delivery vector and some or all of our other product candidates may
require  a  lentiviral  delivery  vector,  a  key  drug  substance  that  delivers  the  CAAR  to  the  target  T  cells.  We  do  not  have  the  capability  to  manufacture
lentiviral vector and plan to obtain the vector we require from third parties. The manufacturing process for lentiviral vector is variable and still evolving. It
is not uncommon for manufacturing runs to fail, whether due to contamination, supplier error, or equipment failure, or to be delayed. To the extent our
product candidates use a lentiviral delivery vector, a lack of vector supply will cause us to be unable to manufacture our CAAR T cells as well as a delay in
patient enrollment, which may have a negative impact on our ability to successfully develop our product candidates.

Further, there are a limited number of manufacturers capable of producing lentiviral vectors. It can be challenging to secure a relationship with any
of these manufacturers, and the manufacturing and release process can take a significant amount of time. We have secured a supply of lentiviral vector from
CHOP  sufficient  for  a  portion  of  the  patients  we  plan  to  enroll  in  our  DesCAARTesTM  Trial.  We  have  also  reserved  additional  vector  manufacturing
capacity at Penn and we have engaged other CDMOs to evaluate their potential capabilities and capacity for additional supply. There is no assurance that
we  will  be  able  to  secure  adequate  and  timely  supply  of  lentiviral  vector.  Moreover,  we  cannot  be  certain  that  our  CAAR  T  cell  product  candidates
produced  with  lentiviral  vector  from  different  manufacturers  will  be  comparable  or  that  results  of  clinical  trials  will  be  consistent  if  conducted  with
lentiviral vector from different manufacturers.

Vector production also requires the production of high-quality DNA plasmids, for which there is also a limited number of suppliers. Although we
have established relationships with multiple suppliers for lentiviral vector and plasmids, we do not yet have our own clinical-scale manufacturing facility
established, and are therefore highly dependent on the ability of these suppliers to manufacture necessary materials and to deliver these materials to us on a
timely and reliable basis.

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We may encounter difficulties in production, particularly with respect to process development or scaling up of our manufacturing capabilities.
If  we  encounter  such  difficulties,  our  ability  to  provide  supply  of  our  CAAR  T  cells  for  clinical  trials  or  for  commercial  purposes  could  be
delayed or stopped.

Establishing clinical and commercial manufacturing and supply is a difficult and uncertain task, and there are risks associated with scaling to the
level  required  for  advanced  clinical  trials  or  commercialization,  including,  among  others,  increased  costs,  potential  problems  with  process  scale-out,
process  reproducibility,  stability  issues,  lot  consistency,  and  timely  availability  of  reagents  or  raw  materials.  For  example,  we  may  find  it  difficult  to
establish a manufacturing process that is consistent. If this occurs, we may need to complete more than one manufacturing run for each treated patient,
which  would  impact  the  availability  of  adequate  coverage  and  reimbursement  from  third-party  payors.  Competitors  that  have  developed  CAR  T  cell
therapies have had difficulty reliably producing engineered T cell therapies in the commercial setting. If we experience similar challenges manufacturing
product  candidates  to  approved  specifications,  this  may  limit  our  product  candidates’  utilization  and  our  ability  to  receive  payment  for  these  product
candidates once licensed. Alternatively, these challenges may require changes to our manufacturing processes, which could require us to perform additional
clinical studies, incurring significant expense. We may ultimately be unable to reduce the expenses associated with our product candidates to levels that
will allow us to achieve a profitable return on investment.

If  we  or  our  third-party  suppliers  use  hazardous,  non-hazardous,  biological  or  other  materials  in  a  manner  that  causes  injury  or  violates
applicable law, we may be liable for damages.

Our  research  and  development  activities  involve  the  controlled  use  of  potentially  hazardous  substances,  including  chemical  and  biological
materials. We and our suppliers are subject to federal, state and local laws and regulations in the United States governing the use, manufacture, storage,
handling  and  disposal  of  medical  and  hazardous  materials.  Although  we  believe  that  we  and  our  suppliers’  procedures  for  using,  handling,  storing  and
disposing of these materials comply with legally prescribed standards, we and our suppliers cannot completely eliminate the risk of contamination or injury
resulting  from  medical  or  hazardous  materials.  As  a  result  of  any  such  contamination  or  injury,  we  may  incur  liability  or  local,  city,  state  or  federal
authorities may curtail the use of these materials and interrupt our business operations. In the event of an accident, we could be held liable for damages or
penalized with fines, and the liability could exceed our resources. We do not have any insurance for liabilities arising from medical or hazardous materials.
Compliance with applicable environmental laws and regulations is expensive, and current or future environmental regulations may impair our research,
development and production efforts, which could harm our business, prospects, financial condition or results of operations.

Changes in product candidate manufacturing or formulation may result in additional costs or delay, which could adversely affect our business,
results of operations and financial condition.

As product candidates are developed through preclinical studies to later-stage clinical trials towards approval and commercialization, it is common
that  various  aspects  of  the  development  program,  such  as  manufacturing  methods  or  formulation,  are  altered  along  the  way  in  an  effort  to  optimize
processes and results. Any of these changes could cause our product candidates to perform differently and affect the results of planned clinical trials or
other future clinical trials conducted with the altered materials or with materials made with the altered methods. Such changes may also require additional
testing,  or  notification  to,  or  approval  by  the  FDA  or  other  regulatory  authorities.  This  could  delay  completion  of  clinical  trials,  require  the  conduct  of
bridging clinical trials or studies, require the repetition of one or more clinical trials, increase clinical trial costs, delay approval of our product candidates
and/or jeopardize our ability to commence product sales and generate revenue.

Risks Related to Government Regulation

The FDA regulatory approval process is lengthy and time-consuming, and we may experience significant delays in the clinical development
and regulatory approval of our product candidates.

The research, testing, manufacturing, labeling, approval, selling, import, export, marketing and distribution of drug products, including biologics,
are subject to extensive regulation by the FDA and other regulatory authorities in the United States. We are not permitted to market any biological drug
product in the United States until we receive approval of a Biologics License Application, or BLA, from the FDA. We have not previously submitted a
BLA to the FDA, or similar licensure filings to comparable foreign authorities. A BLA must include extensive preclinical and clinical data and supporting
information to establish the product candidate’s safety, potency and purity for each desired indication. The BLA must also include significant information
regarding the chemistry, manufacturing and controls for the product, including with respect to chain of identity and chain of custody of the product.

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We expect the novel nature of our product candidates to create further challenges in obtaining regulatory approval. For example, the FDA has not
previously  reviewed  regulatory  applications  for  the  commercial  development  of  CAAR  T  cells  for  treatment  of  pemphigus,  and  there  is  no  therapy
currently  approved  by  the  FDA  for  the  treatment  of  mPV.  Because  of  this,  we  have  little  guidance  as  to  which  endpoints  will  be  accepted,  how  many
clinical  trials  we  may  expect  to  conduct,  and  whether  open-label  clinical  trials  will  be  deemed  acceptable,  among  other  things.  We  may  also  request
regulatory approval of future CAAR T cell-based product candidates by target, regardless of disease type or origin, which the FDA may have difficulty
accepting  if  our  clinical  trials  only  involved  diseases  of  certain  origins.  The  FDA  may  also  require  a  panel  of  experts,  referred  to  as  an  Advisory
Committee, to deliberate on the adequacy of the safety, potency and purity data to support licensure. The opinion of the Advisory Committee, although not
binding, may have a significant impact on our ability to obtain licensure of the product candidates based on the completed clinical trials, as the FDA often
adheres  to  the  Advisory  Committee’s  recommendations.  Further,  given  the  rapidly  evolving  landscape  of  cell  therapy,  we  could  encounter  a  significant
change  in  the  regulatory  environment  for  our  product  candidates  once  we  have  already  begun  one  or  more  lengthy  and  expensive  clinical  trials  for  our
product  candidates.  Accordingly,  the  regulatory  approval  pathway  for  our  product  candidates  may  be  uncertain,  complex,  expensive  and  lengthy,  and
approval may not be obtained.

We may also experience delays in completing planned clinical trials for a variety of reasons, including delays related to:

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obtaining regulatory authorization to begin a trial, if applicable;

the availability of financial resources to commence and complete the planned trials;

reaching  agreement  on  acceptable  terms  with  prospective  CROs  and  clinical  trial  sites,  the  terms  of  which  can  be  subject  to  extensive
negotiation and may vary significantly among different CROs and trial sites;

obtaining approval at each clinical trial site by an independent IRB;

recruiting suitable patients to participate in a trial;

having patients complete a trial, including having patients enrolled in clinical trials dropping out of the trial before the product candidate is
manufactured and returned to the site, or return for post-treatment follow-up;

clinical trial sites deviating from trial protocol or dropping out of a trial;

addressing any patient safety concerns that arise during a trial;

adding new clinical trial sites; or

manufacturing sufficient quantities of qualified materials under cGMPs and applying them on a patient by patient basis for use in clinical
trials.

We could also encounter delays if physicians encounter unresolved ethical issues associated with enrolling patients in clinical trials of our product
candidates  in  lieu  of  prescribing  existing  treatments  that  have  established  safety  and  efficacy  profiles.  Further,  a  clinical  trial  may  be  suspended  or
terminated by us, the IRBs for the institutions in which such trials are being conducted or by the FDA or other regulatory authorities due to a number of
factors, including failure to conduct the clinical trial in accordance with regulatory requirements or our clinical protocols, inspection of the clinical trial
operations or trial site by the FDA or other regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side
effects, failure to demonstrate a benefit from using a product candidate, changes in governmental regulations or administrative actions, lack of adequate
funding to continue the clinical trial, or based on a recommendation by the DSMB. If we experience termination of, or delays in the completion of, any
future  clinical  trial  of  our  product  candidates,  the  commercial  prospects  for  our  product  candidates  will  be  harmed,  and  our  ability  to  generate  product
revenue will be delayed. In addition, any delays in completing our clinical trials will increase our costs, slow down our product development and approval
process  and  jeopardize  our  ability  to  commence  product  sales  and  generate  revenue.  Many  of  the  factors  that  cause,  or  lead  to,  a  delay  in  the
commencement or completion of clinical trials may ultimately lead to the denial of regulatory approval of our product candidates.

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We  expect  the  product  candidates  we  develop  will  be  regulated  as  biological  products,  or  biologics,  and  therefore  they  may  be  subject  to
competition.

The Biologics Price Competition and Innovation Act of 2009, or BPCIA, was enacted as part of the Patient Protection and Affordable Care Act, as
amended by the Health Care and Education Reconciliation Act, or collectively the ACA, to establish an abbreviated pathway for the approval of biosimilar
and  interchangeable  biological  products.  The  regulatory  pathway  establishes  legal  authority  for  the  FDA  to  review  and  approve  biosimilar  biologics,
including the possible designation of a biosimilar as “interchangeable” based on its similarity to a licensed biologic. Under the BPCIA, an application for a
biosimilar product cannot be licensed by the FDA until 12 years after the reference product was licensed under a BLA. The law is complex and is still
being interpreted and implemented by the FDA. In addition, as discussed more fully below, since the BPCIA was enacted as part of the ACA, if the ACA is
invalidated in its entirety as unconstitutional, then the BPCIA could be considered invalid as well. While it is uncertain when such processes intended to
implement the BPCIA may be fully adopted by the FDA, any such processes could have a material adverse effect on the future commercial prospects for
our biological product candidates.

We believe that any of the product candidates we develop that is licensed in the United States as a biological product under a BLA should qualify
for the 12-year period of exclusivity. However, there is a risk that this exclusivity could be shortened due to congressional action or otherwise, or that the
FDA  will  not  consider  the  subject  product  candidates  to  be  reference  products  for  competing  products,  potentially  creating  the  opportunity  for  generic
competition sooner than anticipated. Moreover, the extent to which a biosimilar, once licensed, will be substituted for any one of the reference products in a
way  that  is  similar  to  traditional  generic  substitution  for  non-biological  products  is  not  yet  clear,  and  will  depend  on  a  number  of  marketplace  and
regulatory factors that are still developing.

The regulatory landscape that will govern our product candidates is uncertain; regulations relating to more established cell therapies and other
therapies  for  B  cell-mediated  autoimmune  diseases  are  still  developing,  and  changes  in  regulatory  requirements  could  result  in  delays  or
discontinuation of development of our product candidates or unexpected costs in obtaining regulatory approval.

Because we are developing novel CAAR T cell product candidates that are unique biological entities, the regulatory requirements that we will be
subject to are not entirely clear. Even with respect to more established products that fit into the categories of gene therapies or cell therapies, the regulatory
landscape is still developing. For example, regulatory requirements governing gene therapy products and cell therapy products have changed frequently and
may continue to change in the future. Moreover, there is substantial, and sometimes uncoordinated, overlap in those responsible for regulation of existing
gene therapy products and cell therapy products. For example, in the United States, the FDA has established the Office of Tissues and Advanced Therapies,
formerly known as the Office of Cellular, Tissue and Gene Therapies, within its Center for Biologics Evaluation and Research, or CBER, to consolidate the
review of gene therapy and related products, and the Cellular, Tissue and Gene Therapies Advisory Committee to advise CBER on its review. Gene therapy
clinical trials are also subject to review and oversight by an institutional biosafety committee, a local institutional committee that reviews and oversees
basic  and  clinical  research  conducted  at  the  institution  participating  in  the  clinical  trial.  Although  the  FDA  decides  whether  individual  gene  therapy
protocols may proceed, review process and determinations of other reviewing bodies can impede or delay the initiation of a clinical study, even if the FDA
has  reviewed  the  study  and  approved  its  initiation.  Conversely,  the  FDA  can  place  an  IND  application  on  clinical  hold  even  if  such  other  entities  have
provided  a  favorable  review.  Furthermore,  each  clinical  trial  must  be  reviewed  and  approved  by  an  independent  IRB  at  or  servicing  each  institution  at
which a clinical trial will be conducted. In addition, adverse developments in clinical trials of gene therapy products conducted by others may cause the
FDA or other regulatory bodies to change the requirements for approval of any of our product candidates.

Complex regulatory environments exist in other jurisdictions in which we might consider seeking regulatory approvals for our product candidates,
further complicating the regulatory landscape. For example, in the European Union, a special committee called the Committee for Advanced Therapies was
established within the EMA in accordance with Regulation (EC) No 1394/2007 on advanced-therapy medicinal products, or ATMPs, to assess the quality,
safety and efficacy of ATMPs, and to follow scientific developments in the field. ATMPs include gene therapy products as well as somatic cell therapy
products and tissue engineered products. These various regulatory

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review committees and advisory groups and new or revised guidelines that they promulgate from time to time may lengthen the regulatory review process,
require  us  to  perform  additional  studies,  increase  our  development  costs,  lead  to  changes  in  regulatory  positions  and  interpretations,  delay  or  prevent
approval and commercialization of our product candidates or lead to significant post-approval limitations or restrictions. Because the regulatory landscape
for  our  CAAR  T  cell  product  candidates  is  new,  we  may  face  even  more  cumbersome  and  complex  regulations  than  those  emerging  for  gene  therapy
products  and  cell  therapy  products.  Furthermore,  even  if  our  product  candidates  obtain  required  regulatory  approvals,  such  approvals  may  later  be
withdrawn because of changes in regulations or the interpretation of regulations by applicable regulatory agencies. Delay or failure to obtain, or unexpected
costs in obtaining, the regulatory approval necessary to bring a potential product to market could decrease our ability to generate sufficient product revenue
to maintain our business.

If we are not able to obtain, or if there are delays in obtaining, required regulatory approvals for our product candidates, we will not be able to
commercialize, or will be delayed in commercializing, our product candidates, and our ability to generate revenue will be materially impaired.

Our product candidates and the activities associated with their development and commercialization, including their design, testing, manufacture,
safety,  efficacy,  recordkeeping,  labeling,  storage,  approval,  advertising,  promotion,  sale,  distribution,  import  and  export  are  subject  to  comprehensive
regulation by the FDA and other regulatory agencies in the United States. Before we can commercialize any of our product candidates, we must obtain
marketing approval. We have not received approval to market any of our product candidates from regulatory authorities in any jurisdiction and it is possible
that none of our product candidates or any product candidates we may seek to develop in the future will ever obtain regulatory approval. We, as a company,
have  no  experience  in  filing  and  supporting  the  applications  necessary  to  gain  regulatory  approvals  and  expect  to  rely  on  third-party  CROs  and/or
regulatory  consultants  to  assist  us  in  this  process.  Securing  regulatory  approval  requires  the  submission  of  extensive  preclinical  and  clinical  data  and
supporting information to the various regulatory authorities for each therapeutic indication to establish the drug candidate’s safety, potency and purity.

Securing regulatory approval also requires the submission of information about the drug manufacturing process to, and inspection of manufacturing
facilities  by,  the  relevant  regulatory  authority.  Our  product  candidates  may  not  be  effective,  may  be  only  moderately  effective  or  may  prove  to  have
undesirable or unintended side effects, toxicities or other characteristics that may preclude our obtaining marketing approval or prevent or limit commercial
use.

The process of obtaining regulatory approvals is expensive, may take many years if additional clinical trials are required, if approval is obtained at
all, and can vary substantially based upon a variety of factors, including the type, complexity and novelty of the product candidates involved. Changes in
marketing  approval  policies  during  the  development  period,  changes  in  or  the  enactment  of  additional  statutes  or  regulations,  or  changes  in  regulatory
review  for  each  submitted  IND,  BLA  or  equivalent  application  types,  may  cause  delays  in  the  approval  or  rejection  of  an  application.  The  FDA  has
substantial discretion in the approval process and may refuse to accept any application or may decide that our data are insufficient for approval and require
additional  preclinical,  clinical  or  other  studies.  Our  product  candidates  could  be  delayed  in  receiving,  or  fail  to  receive,  regulatory  approval  for  many
reasons, including the following:

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•

•

the FDA may disagree with the design or implementation of our clinical trials;

we may be unable to demonstrate to the satisfaction of the FDA that a drug candidate is safe, potent and pure for its proposed indication or
a related companion diagnostic is suitable to identify appropriate patient populations;

the results of clinical trials may not meet the level of statistical significance required by the FDA for approval;

we may be unable to demonstrate that a product candidate’s clinical and other benefits outweigh its safety risks;

the FDA may disagree with our interpretation of data from preclinical studies or clinical trials;

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•

•

•

the  data  collected  from  clinical  trials  of  our  product  candidates  may  not  be  sufficient  to  support  the  submission  of  an  BLA  or  other
submission or to obtain regulatory approval in the United States or elsewhere;

the FDA may fail to approve the manufacturing processes, test procedures and specifications, or facilities that we may establish or of third-
party manufacturers with which we may contract for clinical and commercial supplies; and

the approval policies or regulations of the FDA may significantly change in a manner rendering our clinical data insufficient for approval.

Of the large number of drugs in development, only a small percentage successfully complete the FDA approval process and are commercialized.
The lengthy approval process as well as the unpredictability of future clinical trial results may result in our failing to obtain regulatory approval to market
our product candidates, which would significantly harm our business, results of operations and prospects.

We  expect  the  novel  nature  of  our  product  candidates  to  create  further  challenges  in  obtaining  regulatory  approval.  As  a  result,  our  ability  to
develop product candidates and obtain regulatory approval may be significantly impacted. For example, the general approach for FDA approval of a new
biologic or drug is for sponsors to seek licensure or approval based on dispositive data from well-controlled, Phase 3 clinical trials of the relevant product
candidate in the relevant patient population. Phase 3 clinical trials typically involve hundreds of patients, have significant costs and take years to complete.
We believe that we may be able to utilize the FDA’s Regenerative Medicine Advanced Therapy designation for our product candidates given the limited
alternatives for treatments for certain rare diseases and B cell-mediated autoimmune diseases, but the FDA may not agree with our plans.

Moreover,  approval  of  genetic  or  biomarker  diagnostic  tests  may  be  necessary  to  advance  some  of  our  product  candidates  to  clinical  trials  or
potential  commercialization.  In  the  future,  regulatory  agencies  may  require  the  development  and  approval  of  such  tests.  Accordingly,  the  regulatory
approval pathway for such product candidates may be uncertain, complex, expensive and lengthy, and approval may not be obtained.

In  addition,  even  if  we  were  to  obtain  approval,  regulatory  authorities  may  approve  any  of  our  product  candidates  for  fewer  or  more  limited
indications than we request, may not approve the price we intend to charge for our products, if licensed, may grant approval contingent on the performance
of costly post-marketing clinical trials, or may approve a product candidate with a label that does not include the labeling claims necessary or desirable for
the successful commercialization of that product candidate. Any of the foregoing scenarios could materially harm the commercial prospects for our product
candidates.

If we experience delays in obtaining approval or if we fail to obtain approval of our product candidates, the commercial prospects for our product

candidates may be harmed and our ability to generate revenues will be materially impaired.

Even  though  we  may  apply  for  orphan  drug  designation  for  our  product  candidates,  we  may  not  be  able  to  obtain  orphan  drug  marketing
exclusivity.

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biologic intended to treat a rare disease or condition, defined as a
disease or condition with a patient population of fewer than 200,000 in the United States, or a patient population of 200,000 or more in the United States
when there is no reasonable expectation that the cost of developing and making available the drug or biologic in the United States will be recovered from
sales in the United States for that drug or biologic. In order to obtain orphan drug designation, the request must be made before submitting a BLA. In the
United  States,  orphan  drug  designation  entitles  a  party  to  financial  incentives  such  as  opportunities  for  grant  funding  towards  clinical  trial  costs,  tax
advantages, and user-fee waivers. After the FDA grants orphan drug designation, the generic identity of the drug and its potential orphan use are disclosed
publicly by the FDA. Orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review and approval process.

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If a product that has orphan drug designation subsequently receives the first FDA approval of that particular product for the disease for which it has
such  designation,  the  product  is  entitled  to  orphan  product  exclusivity,  which  means  that  the  FDA  may  not  approve  any  other  applications,  including  a
BLA, to market the same biologic (meaning, a product with the same principal molecular structural features) for the same indication for seven years, except
in limited circumstances such as a showing of clinical superiority to the product with orphan drug exclusivity or if FDA finds that the holder of the orphan
drug exclusivity has not shown that it can assure the availability of sufficient quantities of the orphan drug to meet the needs of patients with the disease or
condition for which the drug was designated. As a result, even if one of our product candidates receives orphan exclusivity, the FDA can still approve other
biologics  that  do  not  have  the  same  principal  molecular  structural  features  for  use  in  treating  the  same  indication  or  disease  or  the  same  biologic  for  a
different indication or disease during the exclusivity period. Furthermore, the FDA can waive orphan exclusivity if we are unable to manufacture sufficient
supply of our product or if a subsequent applicant demonstrates clinical superiority over our product.

We have obtained from the FDA orphan drug designation for DSG3-CAART for the treatment of pemphigus vulgaris (PV). We may seek orphan
drug designation for certain other of our product candidates, but may be unable to obtain orphan drug designation for some or all of our product candidates
in  specific  orphan  indications  in  which  we  believe  there  is  a  medically  plausible  basis  for  the  use  of  these  products.  Even  if  we  obtain  orphan  drug
designation,  exclusive  marketing  rights  in  the  United  States  may  be  limited  if  we  seek  approval  for  an  indication  broader  than  the  orphan  designated
indication and may be lost if the FDA later determines that the request for designation was materially defective or if we are unable to assure sufficient
quantities of the product to meet the needs of patients with the rare disease or condition, or if a subsequent applicant demonstrates clinical superiority over
our products, if licensed. In addition, although we may seek orphan drug designation for other product candidates, we may never receive such designations.

Although we may pursue expedited regulatory approval pathways for a product candidate, it may not qualify for expedited development or, if it
does qualify for expedited development, it may not actually lead to a faster development or regulatory review or approval process.

Although we believe there may be an opportunity to accelerate the development of certain of our product candidates through one or more of the
FDA’s expedited programs, such as fast track, breakthrough therapy, Regenerative Medicine Advanced Therapy, accelerated approval or priority review, we
cannot be assured that any of our product candidates will qualify for such programs.

For example, we may seek a Regenerative Medicine Advanced Therapy, or RMAT, designation for some of our product candidates. An RMAT is
defined as cell therapies, therapeutic tissue engineering products, human cell and tissue products, and combination products using any such therapies or
products.  Gene  therapies,  including  genetically  modified  cells  that  lead  to  a  durable  modification  of  cells  or  tissues  may  meet  the  definition  of  a
Regenerative Medicine Therapy. The RMAT program is intended to facilitate efficient development and expedite review of RMATs, which are intended to
treat, modify, reverse, or cure a serious or life-threatening disease or condition. A new drug application or a BLA for an RMAT may be eligible for priority
review or accelerated approval through (1) surrogate or intermediate endpoints reasonably likely to predict long-term clinical benefit or (2) reliance upon
data obtained from a meaningful number of sites. Benefits of such designation also include early interactions with FDA to discuss any potential surrogate
or intermediate endpoint to be used to support accelerated approval. A Regenerative Medicine Therapy that is granted accelerated approval and is subject to
post-approval requirements may fulfill such requirements through the submission of clinical evidence, clinical studies, patient registries, or other sources of
real world evidence, such as electronic health records; the collection of larger confirmatory data sets; or post-approval monitoring of all patients treated
with such therapy prior to its approval. Although RMAT designation or access to any other expedited program may expedite the development or approval
process, it does not change the standards for approval. If we apply for RMAT designation or any other expedited program for our product candidates, the
FDA may determine that our proposed target indication or other aspects of our clinical development plans do not qualify for such expedited program. Even
if we are successful in obtaining a RMAT designation or access to any other expedited program, we may not experience faster development timelines or
achieve faster review or approval compared to conventional FDA procedures. Access to an expedited program may also be withdrawn by the FDA if it
believes that the designation is no longer supported by data from our clinical development program. Additionally, qualification for any expedited review
procedure does not ensure that we will ultimately obtain regulatory approval for such product candidate.

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Even if we receive regulatory approval of our product candidates, we will be subject to ongoing regulatory obligations and continued regulatory
review, which may result in significant additional expense and we may be subject to penalties if we fail to comply with regulatory requirements
or experience unanticipated problems with our product candidates.

Any  regulatory  approvals  that  we  receive  for  our  product  candidates  will  require  surveillance  to  monitor  the  safety,  potency  and  purity  of  the
product candidate. We believe it is likely that the FDA will require a Risk Evaluation and Mitigation Strategy, or REMS, in order to approve our product
candidates,  which  could  entail  requirements  for  a  medication  guide,  physician  communication  plans  or  additional  elements  to  assure  safe  use,  such  as
restricted  distribution  methods,  patient  registries  and  other  risk  minimization  tools.  In  addition,  if  the  FDA  approves  our  product  candidates,  the
manufacturing processes, labeling, packaging, distribution, adverse event reporting, storage, advertising, promotion, import, export and recordkeeping for
our product candidates will be subject to extensive and ongoing regulatory requirements. These requirements include submissions of safety and other post-
marketing  information  and  reports,  registration,  as  well  as  continued  compliance  with  cGMPs  and  cGCPs  for  any  clinical  trials  that  we  conduct  post-
approval. As such, we and our contract manufacturers will be subject to continual review and inspections to assess compliance with cGMP and adherence
to  commitments  made  in  any  BLA,  other  marketing  application  and  previous  responses  to  inspectional  observations.  Accordingly,  we  and  others  with
whom we work must continue to expend time, money and effort in all areas of regulatory compliance, including manufacturing, production and quality
control. In addition, the FDA could require us to conduct another study to obtain additional safety or biomarker information.

Further, we will be required to comply with FDA promotion and advertising rules, which include, among others, standards for direct-to-consumer
advertising, restrictions on promoting products for uses or in patient populations that are not described in the product’s approved uses (known as “off-label
use”), limitations on industry-sponsored scientific and educational activities and requirements for promotional activities involving the internet and social
media. Later discovery of previously unknown problems with our product candidates through follow-up programs with our clinical trial patients, including
adverse events of unanticipated severity or frequency, or with our third-party suppliers or manufacturing processes, or failure to comply with regulatory
requirements, may result in revisions to the approved labeling to add new safety information, imposition of post-market studies or clinical studies to assess
new safety risks, or imposition of distribution restrictions or other restrictions under a REMS program. Other potential consequences include, among other
things:

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•

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•

restrictions  on  the  marketing  or  manufacturing  of  our  product  candidates,  withdrawal  of  the  product  from  the  market  or  voluntary  or
mandatory product recalls;

fines, warning letters or holds on clinical trials;

refusal by the FDA to approve pending applications or supplements to approved applications filed by us or suspension or revocation of
license approvals;

product seizure or detention, or refusal to permit the import or export of our product candidates; and

injunctions or the imposition of civil or criminal penalties.

The FDA’s policies may change and additional government regulations may be enacted that could prevent, limit or delay regulatory approval of our
product candidates. We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative or
executive action. For example, certain policies of the current U.S. President’s administration may impact our business and industry. Namely, the current
U.S. President’s administration has taken several executive actions, including the issuance of a number of Executive Orders, that could impose significant
burdens  on,  or  otherwise  materially  delay,  FDA’s  ability  to  engage  in  routine  oversight  activities  such  as  implementing  statutes  through  rulemaking,
issuance of guidance, and review and approval of marketing applications. It is difficult to predict how these orders will be implemented, and the extent to
which they will impact the FDA’s ability to exercise its regulatory authority. If these executive actions impose restrictions on FDA’s ability to engage in
oversight and implementation activities in the normal course, our business may be negatively impacted. If we are slow or unable to adapt to changes in
existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing
approval that we may have obtained, and we may not achieve or sustain profitability.

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Coverage  and  reimbursement  may  be  limited  or  unavailable  in  certain  market  segments  for  our  product  candidates,  which  could  make  it
difficult for us to sell our product candidates, if licensed, profitably.

Successful  commercialization  of  our  product  candidates,  if  licensed,  will  depend  in  part  on  the  extent  to  which  reimbursement  for  those  drug
products will be available from government health administration authorities, private health insurers, and other organizations. Government authorities and
third-party  payors,  such  as  private  health  insurers  and  health  maintenance  organizations,  decide  which  drug  products  they  will  pay  for  and  establish
reimbursement levels. The availability and extent of reimbursement by governmental and private payors is essential for most patients to be able to afford a
drug product. Sales of drug products depend substantially, both domestically and abroad, on the extent to which the costs of drugs products are paid for by
health maintenance, managed care, pharmacy benefit and similar healthcare management organizations, or reimbursed by government health administration
authorities, private health coverage insurers and other third-party payors. Significant uncertainty exists as to the coverage and reimbursement status of any
product candidates for which we obtain regulatory approval. Any product candidate for which we seek regulatory approval and reimbursement will need to
meet  or  surpass  our  target  product  profile,  or  TPP,  to  be  deemed  a  viable  alternative  to  currently  approved  therapies.  In  addition,  because  our  product
candidates represent new approaches to the treatment of B cell-mediated autoimmune diseases, we cannot accurately estimate the potential revenue from
our product candidates.

Third-party payors decide which drugs and treatments they will cover and the amount of reimbursement. Reimbursement by a third-party payor

may depend upon a number of factors, including, but not limited to, the third-party payor’s determination that use of a product is:

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a covered benefit under its health plan;

safe, effective and medically necessary;

appropriate for the specific patient;

cost-effective; and

neither experimental nor investigational.

Obtaining  coverage  and  reimbursement  of  a  product  from  a  government  or  other  third-party  payor  is  a  time-consuming  and  costly  process  that
could require us to provide the payor with supporting scientific, clinical and cost-effectiveness data for the use of our products, if licensed. In the United
States, the principal decisions about reimbursement for new drug products are typically made by the Centers for Medicare and Medicaid Services, or CMS,
an  agency  within  the  U.S.  Department  of  Health  and  Human  Services,  or  HHS.  CMS  decides  whether  and  to  what  extent  a  new  drug  product  will  be
covered  and  reimbursed  under  Medicare,  and  private  payors  tend  to  follow  CMS  to  a  substantial  degree.  However,  no  uniform  policy  of  coverage  and
reimbursement for drug products exists among third-party payors and coverage and reimbursement levels for drug products can differ significantly from
payor to payor. Further, one payor’s determination to provide coverage for a product does not assure that other payors will also provide coverage for the
product. Adequate third-party reimbursement may not be available to enable us to maintain price levels sufficient to realize an appropriate return on our
investment in product development.

Even if we obtain coverage for a given product, if the resulting reimbursement rates are insufficient, hospitals may not approve our product for use
in  their  facility  or  third-party  payors  may  require  co-payments  that  patients  find  unacceptably  high.  Patients  are  unlikely  to  use  our  product  candidates
unless coverage is provided and reimbursement is adequate to cover a significant portion of the cost of our product candidates. Separate reimbursement for
the  product  itself  may  or  may  not  be  available.  Instead,  the  hospital  or  administering  physician  may  be  reimbursed  only  for  providing  the  treatment  or
procedure  in  which  our  product  is  used.  Further,  from  time  to  time,  CMS  revises  the  reimbursement  systems  used  to  reimburse  health  care  providers,
including the Medicare Physician Fee Schedule and Outpatient Prospective Payment System, which may result in reduced Medicare payments. In some
cases,  private  third-party  payors  rely  on  all  or  portions  of  Medicare  payment  systems  to  determine  payment  rates.  Changes  to  government  healthcare
programs  that  reduce  payments  under  these  programs  may  negatively  impact  payments  from  private  third-party  payors,  and  reduce  the  willingness  of
physicians to use our product candidates.

The  marketability  of  any  product  candidates  for  which  we  receive  regulatory  approval  for  commercial  sale  may  suffer  if  government  and  other
third-party  payors  fail  to  provide  coverage  and  adequate  reimbursement.  We  expect  downward  pressure  on  pharmaceutical  pricing  to  continue.  Further,
coverage policies and third-party reimbursement rates may change at any time. Even if favorable coverage and reimbursement status is attained for

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one  or  more  products  for  which  we  receive  regulatory  approval,  less  favorable  coverage  policies  and  reimbursement  rates  may  be  implemented  in  the
future.

Healthcare  legislative  measures  aimed  at  reducing  healthcare  costs  may  have  a  material  adverse  effect  on  our  business  and  results  of
operations.

In the United States, there have been a number of legislative and regulatory changes and proposed changes regarding the healthcare system that
could prevent or delay regulatory approval of our product candidates, restrict or regulate post-approval activities and affect our ability to profitably sell any
product candidates for which we obtain regulatory approval. We expect that current laws, as well as other healthcare reform measures that may be adopted
in the future, may result in additional reductions in Medicare and other healthcare funding, more rigorous coverage criteria, new payment methodologies
and in additional downward pressure on the price that we, or any collaborators, may receive for any approved products.

In March 2010, President Obama signed into law the ACA. Among the provisions of the ACA of potential importance to our business and our

product candidates are the following:

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an annual, non-deductible fee on any entity that manufactures or imports specified branded prescription products and biologic products;

an increase in the statutory minimum rebates a manufacturer must pay under the Medicaid Drug Rebate Program;

a new methodology by which rebates owed by manufacturers under the Medicaid Drug Rebate Program are calculated for products that are
inhaled, infused, instilled, implanted or injected;

expansion of healthcare fraud and abuse laws, including the civil False Claims Act and the federal Anti-Kickback Statute, new government
investigative powers and enhanced penalties for noncompliance;

a new Medicare Part D coverage gap discount program, in which manufacturers must agree to offer 50% (increased to 70% as of January 1,
2019) point-of-sale discounts off negotiated prices of applicable brand products to eligible beneficiaries during their coverage gap period,
as a condition for the manufacturer’s outpatient products to be covered under Medicare Part D;

extension of manufacturers’ Medicaid rebate liability to individuals enrolled in Medicaid managed care organizations;

expansion of the entities eligible for discounts under the Public Health Service pharmaceutical pricing program;

new requirements to report certain financial arrangements with physicians and teaching hospitals;

a new requirement to annually report product samples that manufacturers and distributors provide to physicians;

a  new  Patient-Centered  Outcomes  Research  Institute  to  oversee,  identify  priorities  in,  and  conduct  comparative  clinical  effectiveness
research, along with funding for such research;

a  new  Independent  Payment  Advisory  Board,  or  IPAB,  which  has  authority  to  recommend  certain  changes  to  the  Medicare  program  to
reduce expenditures by the program that could result in reduced payments for prescription products; and

established the Center for Medicare and Medicaid Innovation within CMS to test innovative payment and service delivery models.

Since its enactment, there have been numerous judicial, administrative, executive, and legislative challenges to certain aspects of the ACA, and we
expect  there  will  be  additional  challenges  and  amendments  to  the  ACA  in  the  future.  Various  portions  of  the  ACA  are  currently  undergoing  legal  and
constitutional challenges in the Fifth Circuit Court and the United States Supreme Court and the Trump Administration has issued various Executive Orders
which eliminated cost sharing subsidies and various provisions that would impose a fiscal burden on states or a cost, fee, tax, penalty or regulatory burden
on individuals, healthcare providers, health insurers, or manufacturers of

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pharmaceuticals  or  medical  devices.  Additionally,  Congress  has  introduced  several  pieces  of  legislation  aimed  at  significantly  revising  or  repealing  the
ACA. It is unclear whether the ACA will be overturned, repealed, replaced, or further amended. We cannot predict what affect further changes to the ACA
would have on our business.

Further  legislation  or  regulation  could  be  passed  that  could  harm  our  business,  financial  condition  and  results  of  operations.  Other  legislative
changes have been proposed and adopted since the Affordable Care Act was enacted. For example, in August 2011, President Obama signed into law the
Budget Control Act of 2011, which, among other things included aggregate reductions to Medicare payments to providers of 2% per fiscal year, which
went  into  effect  in  April  2013  and  will  remain  in  effect  through  2029  unless  additional  Congressional  action  is  taken.  In  January  2013,  the  American
Taxpayer Relief Act of 2012 was signed into law, which, among other things, further reduced Medicare payments to several types of providers, including
hospitals, imaging centers and treatment centers, and increased the statute of limitations period for the government to recover overpayments to providers
from three to five years. These new laws and regulations may result in additional reductions in Medicare and other healthcare funding and otherwise affect
the prices we may obtain for any of our product candidates for which we may obtain regulatory approval or the frequency with which any such product
candidate is prescribed or used.

There have been, and likely will continue to be, legislative and regulatory proposals at the foreign, federal and state levels directed at broadening
the  availability  of  healthcare  and  containing  or  lowering  the  cost  of  healthcare.  The  implementation  of  cost  containment  measures  or  other  healthcare
reforms may prevent us from being able to generate revenue, attain profitability, or commercialize our product candidates. Such reforms could have an
adverse effect on anticipated revenue from product candidates that we may successfully develop and for which we may obtain regulatory approval and may
affect our overall financial condition and ability to develop product candidates.

In  addition,  there  has  been  increasing  legislative  and  enforcement  interest  in  the  United  States  with  respect  to  specialty  drug  pricing  practices.
Specifically, there have been several recent U.S. Congressional inquiries and proposed and enacted federal and state legislation designed to, among other
things,  bring  more  transparency  to  drug  pricing,  review  the  relationship  between  pricing  and  manufacturer  patient  assistance  programs,  and  reform
government  program  reimbursement  methodologies  for  drugs.  At  the  federal  level,  the  U.S.  President’s  administration’s  budget  for  fiscal  year  2020
contains further drug price control measures that could be enacted during the 2020 legislative session or in other future legislation, including, for example,
measures to permit Medicare Part D plans to negotiate the price of certain drugs under Medicare Part B, to allow some states to negotiate drug prices under
Medicaid,  and  to  eliminate  cost  sharing  for  generic  drugs  for  low-income  patients.  Further,  the  current  U.S.  President’s  administration  released  a
“Blueprint”,  or  plan,  to  lower  drug  prices  and  reduce  out  of  pocket  costs  of  drugs  that  contains  additional  proposals  to  increase  drug  manufacturer
competition, increase the negotiating power of certain federal healthcare programs, incentivize manufacturers to lower the list price of their products, and
reduce the out of pocket costs of drug products paid by consumers. HHS has already started the process of soliciting feedback on some of these measures
and, at the same, is immediately implementing others under its existing authority. For example, in May 2019, CMS issued a final rule to allow Medicare
Advantage Plans the option of using step therapy, a type of prior authorization, for Part B drugs beginning January 1, 2020. This final rule codified CMS’s
policy  change  that  was  effective  January  1,  2019.  On  September  25,  2019,  the  Senate  Finance  Committee  introduced  the  Prescription  Drug  Pricing
Reduction Action of 2019, a bill intended to reduce Medicare and Medicaid prescription drug prices. The proposed legislation would restructure the Part D
benefit, modify payment methodologies for certain drugs, and impose an inflation cap on drug price increases. An even more restrictive bill, the Lower
Drug Costs Now Act of 2019, was introduced in the House of Representatives on September 19, 2019, and would require HHS to directly negotiate drug
prices with manufacturers. The Lower Drugs Costs Now Act of 2019 has passed out of the House and was delivered to the Senate on December 16, 2019.
However, it is unclear whether either of these bills will make it through both chambers and be signed into law, and if either is enacted, what effect it would
have on our business.

Although a number of these, and other proposed measures will require authorization through additional legislation to become effective, Congress
and the current U.S. President’s administration have each indicated that it will continue to seek new legislative and/or administrative measures to control
drug  costs.  While  some  proposed  measures  will  require  authorization  through  additional  legislation  to  become  effective,  Congress  and  the  current  U.S.
President’s administration have each indicated that it will continue to seek new legislative and/or administrative measures to control drug costs. Individual
states in the United States have also become increasingly active in passing legislation and implementing regulations designed to control pharmaceutical
product pricing, including price or

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patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some
cases, designed to encourage importation from other countries and bulk purchasing.

There have been, and likely will continue to be, legislative and regulatory proposals at the foreign, federal and state levels directed at containing or
lowering the cost of healthcare. For example, in 2016, the United Kingdom referendum on its membership in the EU resulted in a majority of the United
Kingdom voters voting to exit the EU, often referred to as Brexit. Brexit has already and may continue to adversely affect European and/or worldwide
regulatory conditions. Brexit could lead to legal uncertainty and potentially divergent national laws and regulations in Europe, including those related to the
pricing  of  prescription  pharmaceuticals,  as  the  United  Kingdom  determines  which  EU  laws  to  replicate  or  replace,  which  could  impair  our  ability  to
transact business in the EU and the United Kingdom in the future, if we elect to seek regulatory approval and commercialize any of our products there, if
approved.  The  implementation  of  cost  containment  measures  or  other  healthcare  reforms  may  prevent  us  from  being  able  to  generate  revenue,  attain
profitability,  or  commercialize  our  product.  Such  reforms  could  have  an  adverse  effect  on  anticipated  revenue  from  product  candidates  that  we  may
successfully  develop  and  for  which  we  may  obtain  regulatory  approval  and  may  affect  our  overall  financial  condition  and  ability  to  develop  product
candidates.

We cannot predict the initiatives that may be adopted in the future. The continuing efforts of the government, insurance companies, managed care

organizations and other payors of healthcare services to contain or reduce costs of healthcare and/or impose price controls may adversely affect:

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the demand for our product candidates, if we obtain regulatory approval;

our ability to set a price that we believe is fair for our products, if licensed;

our ability to generate revenue and achieve or maintain profitability;

the level of taxes that we are required to pay; and

the availability of capital.

Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payors,

which may adversely affect our future profitability.

If we fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or penalties or incur costs
that could have a material adverse effect on the success of our business.

We  are  subject  to  numerous  environmental,  health  and  safety  laws  and  regulations,  including  those  governing  laboratory  procedures  and  the
handling, use, storage, treatment and disposal of hazardous materials and wastes. Our research and development activities involve the use of biological and
hazardous  materials  and  produce  hazardous  waste  products.  We  generally  contract  with  third  parties  for  the  disposal  of  these  materials  and  wastes.  We
cannot eliminate the risk of contamination or injury from these materials, which could cause an interruption of our commercialization efforts, research and
development  efforts  and  business  operations,  environmental  damage  resulting  in  costly  clean-up  and  liabilities  under  applicable  laws  and  regulations
governing the use, storage, handling and disposal of these materials and specified waste products. Although we believe that the safety procedures utilized
by  our  third-party  manufacturers  for  handling  and  disposing  of  these  materials  generally  comply  with  the  standards  prescribed  by  these  laws  and
regulations, we cannot guarantee that this is the case or eliminate the risk of accidental contamination or injury from these materials. In such an event, we
may be held liable for any resulting damages and such liability could exceed our resources and state or federal or other applicable authorities may curtail
our use of certain materials and/or interrupt our business operations. Furthermore, environmental laws and regulations are complex, change frequently and
have tended to become more stringent. We cannot predict the impact of such changes and cannot be certain of our future compliance. Breach of certain
environmental,  health  and  safety  laws  and  regulations  could  also  in  certain  circumstances  constitute  a  breach  of  our  License  Agreement  with  Penn.  In
addition, we may incur substantial costs in order to comply with current or future environmental, health and safety laws and regulations. These current or
future laws and regulations may impair our research, development or production efforts. Failure to comply with these laws and regulations also may result
in substantial fines, penalties or other sanctions.

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Although we maintain workers’ compensation insurance to cover us for costs and expenses we may incur due to injuries to our employees resulting
from the use of hazardous materials or other work-related injuries, this insurance may not provide adequate coverage against potential liabilities. We do not
carry  specific  biological  waste  or  hazardous  waste  insurance  coverage,  workers  compensation  or  property  and  casualty  and  general  liability  insurance
policies that include coverage for damages and fines arising from biological or hazardous waste exposure or contamination.

Our employees, independent contractors, consultants, commercial partners and vendors may engage in misconduct or other improper activities,
including noncompliance with regulatory standards and requirements.

We are exposed to the risk of employee fraud or other illegal activity by our employees, independent contractors, consultants, commercial partners
and  vendors.  Misconduct  by  these  parties  could  include  intentional,  reckless  and/or  negligent  conduct  that  fails  to  comply  with  the  laws  of  the  FDA,
provide true, complete and accurate information to the FDA, comply with manufacturing standards we have established, comply with healthcare fraud and
abuse  laws  in  the  United  States  and  similar  foreign  fraudulent  misconduct  laws,  or  report  financial  information  or  data  accurately  or  to  disclose
unauthorized activities to us. If we obtain FDA approval of any of our product candidates and begin commercializing those products in the United States,
our  potential  exposure  under  such  laws  will  increase  significantly,  and  our  costs  associated  with  compliance  with  such  laws  are  also  likely  to  increase.
These laws may impact, among other things, our current activities with principal investigators and research patients, as well as proposed and future sales,
marketing and education programs.

Our relationships with customers, healthcare providers, physicians, and third-party payors will be subject, directly or indirectly, to federal and
state  healthcare  fraud  and  abuse  laws,  false  claims  laws,  health  information  privacy  and  security  laws,  and  other  healthcare  laws  and
regulations. If we or our employees, independent contractors, consultants, commercial partners and vendors violate these laws, we could face
substantial penalties.

These  laws  may  impact,  among  other  things,  our  clinical  research  program,  as  well  as  our  proposed  and  future  sales,  marketing  and  education
programs. In particular, the promotion, sales and marketing of healthcare items and services is subject to extensive laws and regulations designed to prevent
fraud,  kickbacks,  self-dealing  and  other  abusive  practices,  including,  without  limitation,  the  federal  Anti-Kickback  Statute  and  the  federal  False  Claims
Act,  which  may  constrain  the  business  or  financial  arrangements  and  relationships  through  which  such  companies  sell,  market  and  distribute
pharmaceutical  products.  These  laws  and  regulations  may  restrict  or  prohibit  a  wide  range  of  pricing,  discounting,  marketing  and  promotion,  sales
commission,  customer  incentive  and  other  business  arrangements.  We  may  also  be  subject  to  federal,  state  and  foreign  laws  governing  the  privacy  and
security of individual identifiable health information and other personally identifiable information. The U.S. healthcare laws and regulations that may affect
our ability to operate include, but are not limited to:

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the federal Anti-Kickback Statute, which prohibits, among other things, knowingly and willfully soliciting, receiving, offering or paying
any remuneration (including any kickback, bribe or rebate), directly or indirectly, overtly or covertly, in cash or in kind, to induce, or in
return  for,  either  the  referral  of  an  individual,  or  the  purchase,  lease,  order  or  recommendation  of  any  good,  facility,  item  or  service  for
which payment may be made, in whole or in part, under a federal healthcare program, such as the Medicare and Medicaid programs. A
person  or  entity  can  be  found  guilty  of  violating  the  statute  without  actual  knowledge  of  the  statute  or  specific  intent  to  violate  it.  In
addition, a claim including items or services resulting from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent
claim for purposes of the False Claims Act, or FCA. The Anti-Kickback Statute has been interpreted to apply to arrangements between
pharmaceutical manufacturers on the one hand and prescribers, purchasers, and formulary managers on the other. There are a number of
statutory exceptions and regulatory safe harbors protecting some common activities from prosecution;

federal  civil  and  criminal  false  claims  laws  and  civil  monetary  penalty  laws,  including  the  FCA,  which  prohibit,  among  other  things,
individuals  or  entities  from  knowingly  presenting,  or  causing  to  be  presented,  false  or  fraudulent  claims  for  payment  to,  or  approval  by
Medicare,  Medicaid,  or  other  federal  healthcare  programs,  knowingly  making,  using  or  causing  to  be  made  or  used  a  false  record  or
statement material to a false or fraudulent claim or an obligation to pay or transmit money to the federal

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government, or knowingly concealing or knowingly and improperly avoiding or decreasing or concealing an obligation to pay money to the
federal government. Manufacturers can be held liable under the FCA even when they do not submit claims directly to government payors if
they  are  deemed  to  “cause”  the  submission  of  false  or  fraudulent  claims.  The  FCA  also  permits  a  private  individual  acting  as  a
“whistleblower” to bring actions on behalf of the federal government alleging violations of the FCA and to share in any monetary recovery;

the  federal  Health  Insurance  Portability  and  Accountability  Act  of  1996,  or  HIPAA,  which  created  new  federal  criminal  statutes  that
prohibit  knowingly  and  willfully  executing,  or  attempting  to  execute,  a  scheme  to  defraud  any  healthcare  benefit  program  or  obtain,  by
means  of  false  or  fraudulent  pretenses,  representations,  or  promises,  any  of  the  money  or  property  owned  by,  or  under  the  custody  or
control  of,  any  healthcare  benefit  program,  regardless  of  the  payor  (e.g.,  public  or  private)  and  knowingly  and  willfully  falsifying,
concealing or covering up by any trick or device a material fact or making any materially false statements in connection with the delivery
of,  or  payment  for,  healthcare  benefits,  items  or  services  relating  to  healthcare  matters.  Similar  to  the  federal  Anti-Kickback  Statute,  a
person or entity can be found guilty of violating HIPAA without actual knowledge of the statute or specific intent to violate it;

HIPAA,  as  amended  by  the  Health  Information  Technology  for  Economic  and  Clinical  Health  Act  of  2009,  or  HITECH,  and  their
respective  implementing  regulations,  which  impose,  among  other  things,  requirements  on  certain  covered  healthcare  providers,  health
plans, and healthcare clearinghouses as well as their respective business associates that perform services for them that involve the use, or
disclosure  of,  individually  identifiable  health  information,  relating  to  the  privacy,  security  and  transmission  of  individually  identifiable
health information without appropriate authorization. HITECH also created new tiers of civil monetary penalties, amended HIPAA to make
civil and criminal penalties directly applicable to business associates, and gave state attorneys general new authority to file civil actions for
damages or injunctions in federal courts to enforce the federal HIPAA laws and seek attorneys’ fees and costs associated with pursuing
federal civil actions; the federal Physician Payment Sunshine Act, created under the Patient Protection and Affordable Care Act, and its
implementing regulations, which require manufacturers of drugs, devices, biologicals and medical supplies for which payment is available
under Medicare, Medicaid or the Children’s Health Insurance Program (with certain exceptions) to report annually to the HHS information
related  to  payments  or  other  transfers  of  value  made  to  physicians  (defined  to  include  doctors,  dentists,  optometrists,  podiatrists  and
chiropractors)  and  teaching  hospitals,  as  well  as  ownership  and  investment  interests  held  by  physicians  and  their  immediate  family
members.  Effective  January  1,  2022,  these  reporting  obligations  will  extend  to  include  transfers  of  value  made  to  certain  non-physician
providers such as physician assistants and nurse practitioners;

federal consumer protection and unfair competition laws, which broadly regulate marketplace activities and activities that potentially harm
consumers; and

analogous state and foreign laws and regulations, such as state anti-kickback and false claims laws, which may apply to sales or marketing
arrangements  and  claims  involving  healthcare  items  or  services  reimbursed  by  non-governmental  third-party  payors,  including  private
insurers,  and  may  be  broader  in  scope  than  their  federal  equivalents;  state  and  foreign  laws  that  require  pharmaceutical  companies  to
comply  with  the  pharmaceutical  industry’s  voluntary  compliance  guidelines  and  the  relevant  compliance  guidance  promulgated  by  the
federal  government  or  otherwise  restrict  payments  that  may  be  made  to  healthcare  providers;  state  and  foreign  laws  that  require  drug
manufacturers  to  report  information  related  to  payments  and  other  transfers  of  value  to  physicians  and  other  healthcare  providers  or
marketing expenditures; and state and foreign laws governing the privacy and security of individually identifiable health information and
other personally identifiable information in certain circumstances, many of which differ from each other in significant ways and often are
not preempted by HIPAA, thus complicating compliance efforts.

The distribution of pharmaceutical products is subject to additional requirements and regulations, including extensive record-keeping, licensing,

storage and security requirements intended to prevent the unauthorized sale of pharmaceutical products.

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The  scope  and  enforcement  of  each  of  these  laws  is  uncertain  and  subject  to  rapid  change  in  the  current  environment  of  healthcare  reform,
especially  in  light  of  the  lack  of  applicable  precedent  and  regulations.  Federal  and  state  enforcement  bodies  have  recently  increased  their  scrutiny  of
interactions between healthcare companies and healthcare providers, which has led to a number of investigations, prosecutions, convictions and settlements
in  the  healthcare  industry.  Ensuring  business  arrangements  comply  with  applicable  healthcare  laws,  as  well  as  responding  to  possible  investigations  by
government authorities, can be time- and resource-consuming and can divert a company’s attention from the business.

The failure to comply with any of these laws or regulatory requirements subjects entities to possible legal or regulatory action. Depending on the
circumstances, failure to meet applicable regulatory requirements can result in civil, criminal and administrative penalties, damages, fines, disgorgement,
individual imprisonment, possible exclusion from participation in federal and state funded healthcare programs, contractual damages and the curtailment or
restructuring of our operations, as well as additional reporting obligations and oversight if we become subject to a corporate integrity agreement or other
agreement to resolve allegations of non-compliance with these laws. Any action for violation of these laws, even if successfully defended, could cause a
pharmaceutical  manufacturer  to  incur  significant  legal  expenses  and  divert  management’s  attention  from  the  operation  of  the  business.  Prohibitions  or
restrictions on sales or withdrawal of future marketed products could materially affect business in an adverse way.

Because of the breadth of these laws and the narrowness of the statutory exceptions and regulatory safe harbors available, it is possible that some of
our business activities, or our arrangements with physicians, some of who receive stock options as compensation, could be subject to challenge under one
or more of such laws. If we or our employees, independent contractors, consultants, commercial partners and vendors violate these laws, we may be subject
to investigations, enforcement actions and/or significant penalties. We have adopted a code of business conduct and ethics, but it is not always possible to
identify and deter employee misconduct or business noncompliance, and the precautions we take to detect and prevent inappropriate conduct may not be
effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming
from a failure to be in compliance with such laws or regulations. Efforts to ensure that our business arrangements will comply with applicable healthcare
laws may involve substantial costs. It is possible that governmental and enforcement authorities will conclude that our business practices may not comply
with current or future statutes, regulations or case law interpreting applicable fraud and abuse or other healthcare laws and regulations. If any such actions
are  instituted  against  us,  and  we  are  not  successful  in  defending  ourselves  or  asserting  our  rights,  those  actions  could  have  a  significant  impact  on  our
business,  including  the  imposition  of  civil,  criminal  and  administrative  penalties,  damages,  disgorgement,  monetary  fines,  possible  exclusion  from
participation in Medicare, Medicaid and other federal healthcare programs, contractual damages, reputational harm, diminished profits and future earnings,
additional reporting requirements and/or oversight if we become subject to a corporate integrity agreement or similar agreement to resolve allegations of
non-compliance with these laws, and curtailment of our operations, any of which could adversely affect our ability to operate our business and our results
of operations.

European  data  collection  is  governed  by  restrictive  regulations  governing  the  use,  processing,  and  cross-border  transfer  of  personal
information.

The  collection  and  processing  of  personal  data  –  including  health  data  –  is  governed  by  the  European  Union-wide  General  Data  Protection
Regulation, or GDPR, which became applicable on May 25, 2018. The GDPR applies to any business, regardless of its location, that provides goods or
services  to  residents  in  the  EU  or  monitors  the  behavior  of  individuals  within  the  European  Union.  The  GDPR  imposes  more  stringent  operational
requirements for processors and controllers of personal data, including, for example, special protections for “sensitive information” which includes health
and genetic information of data subjects residing in the European Union, expanded disclosures about how personal information is to be used, limitations on
retention of information, increased requirements pertaining to health data and pseudonymized (i.e.,  key-coded)  data,  mandatory  data  breach  notification
requirements and higher standards for controllers to demonstrate that they have obtained valid consent for certain data processing activities. GDPR grants
individuals  the  opportunity  to  object  to  the  processing  of  their  personal  information,  allows  them  to  request  deletion  of  personal  information  in  certain
circumstances,  and  provides  the  individual  with  an  express  right  to  seek  legal  remedies  in  the  event  the  individual  believes  his  or  her  rights  have  been
violated. Further, the GDPR imposes strict rules on the transfer of personal data out of the European Union to

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the  United  States  and  other  jurisdictions  that  have  not  been  deemed  to  offer  “adequate”  privacy  protections.  The  GDPR  provides  that  European  Union
Member States may make their own further laws and regulations in relation to the processing of genetic, biometric or health data, which could result in
differences  between  Member  States,  limit  our  ability  to  use  and  share  personal  data  or  could  cause  our  costs  to  increase,  and  harm  our  business  and
financial condition. Our clinical trial activity conducted within the member states of the European Union is regulated by the GDPR. In addition, we are
subject to evolving and strict rules on the transfer of personal data out of the European Union to the United States. Furthermore, the current main data
transfer mechanisms (Privacy Shield and Standard Contractual Clauses) are the subject of a legal challenge before the European Court of Justice, raising
the  possibility  of  future  uncertainty  about  mechanisms  that  may  be  used  to  legitimize  cross-border  transfers  of  personal  data.  Failure  to  comply  with
European Union data protection laws may result in fines (for example, of up to €20,000,000 or up to 4% of the total worldwide annual turnover of the
preceding  financial  year  (whichever  is  higher)  under  the  GDPR)  and  other  administrative  penalties,  which  may  be  onerous  and  adversely  affect  our
business,  financial  condition,  results  of  operations  and  prospects.  As  a  result  of  the  implementation  of  the  GDPR,  we  may  be  required  to  put  in  place
additional  mechanisms  ensuring  compliance  with  the  new  data  protection  rules.  There  is  significant  uncertainty  related  to  the  manner  in  which  data
protection authorities will seek to enforce compliance with GDPR. Enforcement uncertainty and the costs associated with ensuring GDPR compliance be
onerous  and  adversely  affect  our  business,  financial  condition,  results  of  operations  and  prospects.  Further,  the  United  Kingdom’s  decision  to  leave  the
European Union, often referred to as Brexit, has created uncertainty with regard to data protection regulation in the United Kingdom. In particular, it is
unclear how data transfers to and from the United Kingdom will be regulated now that the United Kingdom has left the European Union.

If our security measures are breached or unauthorized access to individually identifiable health information or other personally identifiable
information is otherwise obtained, our reputation may be harmed, and we may incur significant liabilities.

Unauthorized access to, or security breaches of, our systems and databases could result in unauthorized access to data and information and loss,
compromise or corruption of such data and information. The systems of Penn, any CDMOs that we may engage in the future, and present and future CROs,
contractors and consultants also could experience breaches of security leading to the exposure of confidential and sensitive information. Such breaches of
security could be caused by computer hacking, phishing attacks, ransomware, dissemination of computer viruses, worms and other destructive or disruptive
software, denial of service attacks, and other malicious activity, which may be heretofore unknown. The number and complexity of these threats continue to
increase over time.

In the event of a security breach, our company could suffer loss of business, severe reputational damage adversely affecting investor confidence,
regulatory investigations and orders, litigation, indemnity obligations, damages for contract breach, penalties for violation of applicable laws or regulations,
significant costs for remediation and other liabilities. For example, the loss of preclinical study or clinical trial data from completed or future preclinical
studies or clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the
extent that any disruption or security breach were to result in a loss of, or damage to, our data or applications, or inappropriate disclosure of confidential or
proprietary information, we could incur liability and the further development and commercialization of our product candidates could be delayed.

We have incurred and expect to incur significant expenses to prevent security breaches, including costs related to deploying additional personnel
and protection technologies, training employees, and engaging third-party solution providers and consultants. Although we expend significant resources to
create  security  protections  that  shield  our  customer  data  against  potential  theft  and  security  breaches,  such  measures  cannot  provide  absolute  security.
Moreover, as we outsource more of our information systems to vendors and rely more on cloud-based information systems, the related security risks will
increase, and we will need to expend additional resources to protect our technology and information systems.

We have in the past experienced breaches of our security measures. For example, in 2019, we believe a phishing incident led to certain employee
email  accounts  being  accessed  by  an  unauthorized  third  party.  We  initiated  an  investigation  to  determine  whether  further  action  was  required  under
applicable law. The incident did not have a material impact on our business or financial condition. While we believe we responded appropriately, including
implementing remedial measures with the goal of preventing similar such events in the future, there can be no

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assurance that we will be successful in these remedial and preventative measures or in successfully mitigating the effects of potential future incidents or
cyber-attacks.  We  thus  remain  at  risk  for  future  breaches,  including,  without  limitation,  breaches  that  may  occur  as  a  result  of  third-party  action,  or
employee, vendor or contractor error or malfeasance and other causes. If, in the future, we experience a data breach or security incident, we would be likely
to  experience  harm  to  our  reputation,  financial  performance,  and  customer  and  vendor  relationships,  and  the  possibility  of  litigation  or  regulatory
investigations or actions by state and federal governmental authorities and non-U.S. authorities.

Interruptions in the availability of server systems or communications with internet or cloud-based services, or failure to maintain the security,
confidentiality, accessibility or integrity of data stored on such systems, could harm our business.

We  rely  upon  a  variety  of  internet  service  providers,  third-party  web  hosting  facilities  and  cloud  computing  platform  providers  to  support  our
business.  Failure  to  maintain  the  security,  confidentiality,  accessibility  or  integrity  of  data  stored  on  such  systems  could  result  in  interruptions  in  our
operations, damage our reputation in the market, increase our service costs, cause us to incur substantial costs, subject us to liability for damages and/or
fines, and divert our resources from other tasks, any one of which could materially adversely affect our business, financial condition, results of operations
and prospects. If our security measures or those of our third-party data center hosting facilities, cloud computing platform providers, or third-party service
partners, are breached, and unauthorized access is obtained to our data or our information technology systems, we may incur significant legal and financial
exposure and liabilities.

We also do not have control over the operations of the facilities of our cloud service providers and our third-party web hosting providers, and they
also may be vulnerable to damage or interruption from natural disasters, cybersecurity attacks, terrorist attacks, power outages and similar events or acts of
misconduct. In addition, any changes in these providers’ service levels may adversely affect our ability to meet our requirements and operate our business.

Risks Related to Ownership of Our Common Stock

The price of our stock may be volatile, and you could lose all or part of your investment.

The trading price of our common stock is likely to be highly volatile and could be subject to wide fluctuations in response to various factors, some
of which are beyond our control, including limited trading volume. In addition to the factors discussed in this “Risk Factors” section and elsewhere in this
annual report, these factors include:

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the commencement, enrollment or results of our planned preclinical studies or clinical trials of our product candidates or any preclinical
studies or future clinical trials we may conduct, or changes in the development status of our product candidates;

our  decision  to  initiate  a  preclinical  study  or  clinical  trial,  not  to  initiate  a  preclinical  study  or  clinical  trial  or  to  terminate  an  existing
preclinical study or clinical trial;

adverse results or delays in preclinical studies or clinical trials of our product candidates;

any delay in our regulatory filings for our product candidates and any adverse development or perceived adverse development with respect
to the applicable regulatory authority’s review of such filings, including, without limitation, the FDA’s issuance of a “refusal to file” letter
or a request for additional information;

our failure to commercialize our product candidates;

adverse regulatory decisions, including failure to receive regulatory approval of our product candidates;

changes in laws or regulations applicable to our product candidates, including, but not limited to, clinical trial requirements for approvals;

adverse developments concerning our manufacturers or suppliers;

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our inability to obtain adequate product supply for any licensed product or inability to do so at acceptable prices;

our inability to establish collaborations, if needed;

additions or departures of key scientific or management personnel;

unanticipated serious safety concerns related to the use of our product candidates;

introduction of new products or services offered by us or our competitors;

announcements of significant acquisitions, strategic partnerships, joint ventures or capital commitments by us or our competitors;

our ability to effectively manage our growth;

the size and growth of our initial target markets;

our ability to successfully treat additional types of B cell-mediated autoimmune diseases;

actual or anticipated variations in annual or quarterly operating results;

our cash position;

our failure to meet the estimates and projections of the investment community or that we may otherwise provide to the public;

publication of research reports about us or our industry or positive or negative recommendations or withdrawal of research coverage by
securities analysts;

changes in the market valuations of similar companies;

overall performance of the equity markets;

sales of our common stock by us or our stockholders in the future;

trading volume of our common stock;

changes in accounting practices;

ineffectiveness of our internal controls;

disputes or other developments relating to proprietary rights, including patents, litigation matters and our ability to obtain patent protection
for our technologies;

significant lawsuits, including patent or stockholder litigation;

general political and economic conditions; and

other events or factors, many of which are beyond our control.

In addition, the stock market in general, and The Nasdaq Global Select Market and biopharmaceutical companies in particular, have experienced
extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of these companies. Broad market
and industry factors may negatively affect the market price of our common stock, regardless of our actual operating performance. In the past, securities
class action litigation has often been instituted against companies following periods of volatility in the market price of a company’s securities. This type of
litigation, if instituted, could result in substantial costs and a diversion of management’s attention and resources, which would harm our business, operating
results or financial condition.

We do not intend to pay dividends on our common stock, so any returns will be limited to the value of our stock.

We  currently  anticipate  that  we  will  retain  future  earnings  for  the  development,  operation  and  expansion  of  our  business  and  do  not  anticipate

declaring or paying any cash dividends for the foreseeable future. Any return to stockholders will therefore be limited to the appreciation of their stock.

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Our principal stockholders and management own a significant percentage of our stock and will be able to exert significant control over matters
subject to stockholder approval.

Our  executive  officers,  directors,  and  5%  stockholders  beneficially  owned,  in  the  aggregate,  approximately  85.0%  of  our  outstanding  voting
common stock, or 89.0% of our common stock, assuming all shares of non-voting common stock are converted into voting common stock in accordance
with the terms of our amended and restated certificate of incorporation. Accordingly, these stockholders will have the ability to influence us through this
ownership  position  and  significantly  affect  the  outcome  of  all  matters  requiring  stockholder  approval.  For  example,  these  stockholders  may  be  able  to
significantly affect the outcome of elections of directors, amendments of our organizational documents, or approval of any merger, sale of assets, or other
major corporate transaction. This may prevent or discourage unsolicited acquisition proposals or offers for our common stock that you may feel are in your
best interest as one of our stockholders.

We  are  an  emerging  growth  company  and  a  “smaller  reporting  company,”  and  we  cannot  be  certain  if  the  reduced  reporting  requirements
applicable to emerging growth companies and smaller reporting companies will make our common stock less attractive to investors.

We are an emerging growth company, as defined in the Jumpstart Our Business Startups Act, or JOBS Act. For as long as we continue to be an
emerging growth company, we may take advantage of exemptions from various reporting requirements that are applicable to other public companies that
are not emerging growth companies, including not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley
Act of 2002, as amended, or the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy
statements and exemptions from the requirements of holding nonbinding advisory votes on executive compensation and stockholder approval of any golden
parachute payments not previously approved. We could be an emerging growth company for up to five years following the date of completion of our initial
public offering, although circumstances could cause us to lose that status earlier. We will remain an emerging growth company until the earlier of (1) the
last day of the fiscal year (a) following the fifth anniversary of the completion of our initial public offering, (b) in which we have total annual gross revenue
of at least $1.07 billion or (c) in which we are deemed to be a large accelerated filer, which requires the market value of our common stock that is held by
non-affiliates  to  exceed  $700  million  as  of  the  prior  June  30th,  and  (2)  the  date  on  which  we  have  issued  more  than  $1  billion  in  non-convertible  debt
during the prior three-year period.

Under the JOBS Act, emerging growth companies can also delay adopting new or revised accounting standards until such time as those standards
apply  to  private  companies.  We  have  elected  to  use  this  extended  transition  period  for  complying  with  new  or  revised  accounting  standards  that  have
different effective dates for public and private companies until the earlier of the date we (i) are no longer an emerging growth company or (ii) affirmatively
and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, we are not subject to the same new or revised accounting
standards  as  other  public  companies  that  are  not  emerging  growth  companies  and  our  financial  statements  may  not  be  comparable  to  other  public
companies that comply with new or revised accounting pronouncements as of public company effective dates.

We are also a “smaller reporting company,” as defined in Rule 12b-2 under the Securities Exchange Act of 1934, as amended. We would cease to
be a smaller reporting company if we have a public float in excess of $250 million, or have annual revenues in excess of $100 million and a public float in
excess of $700 million, determined on an annual basis. Consequently, even after we no longer qualify as an emerging growth company, we may still qualify
as a “smaller reporting company” which would allow us to take advantage of many of the same exemptions from disclosure requirements including not
being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act and reduced disclosure obligations regarding
executive compensation in our periodic reports and proxy statements. We cannot predict if investors will find our common stock less attractive because we
may  rely  on  these  exemptions.  If  some  investors  find  our  common  stock  less  attractive  as  a  result,  there  may  be  a  less  active  trading  market  for  our
common stock and our stock price may be more volatile.

If  we  fail  to  establish  and  maintain  proper  and  effective  internal  control  over  financial  reporting,  our  operating  results  and  our  ability  to
operate our business could be harmed.

As a public company, we are required to maintain internal control over financial reporting and to report any material weaknesses in such internal

controls. The Sarbanes-Oxley Act requires that we evaluate and determine the

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effectiveness of our internal control over financial reporting and, beginning with our second annual report following our initial public offering, provide a
management  report  on  internal  control  over  financial  reporting.  However,  while  we  remain  an  emerging  growth  company,  we  will  not  be  required  to
include an attestation report on internal control over financial reporting issued by our independent registered public accounting firm.

Ensuring  that  we  have  adequate  internal  financial  and  accounting  controls  and  procedures  in  place  so  that  we  can  produce  accurate  financial
statements on a timely basis is a costly and time-consuming effort that needs to be re-evaluated frequently. Our internal control over financial reporting is a
process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements in accordance
with generally accepted accounting principles. We have begun the process of documenting, reviewing, and improving our internal controls and procedures
for compliance with Section 404 of the Sarbanes-Oxley Act. We have begun recruiting additional finance and accounting personnel with certain skill sets
that we need as a public company.

Implementing  any  appropriate  changes  to  our  internal  controls  may  distract  our  officers  and  employees,  entail  substantial  costs  to  modify  our
existing  processes,  and  take  significant  time  to  complete.  These  changes  may  not,  however,  be  effective  in  maintaining  the  adequacy  of  our  internal
controls, and any failure to maintain that adequacy, or consequent inability to produce accurate financial statements on a timely basis, could increase our
operating costs and harm our business. In addition, investors’ perceptions that our internal controls are inadequate or that we are unable to produce accurate
financial statements on a timely basis may harm our stock price and make it more difficult for us to effectively market and sell our service to new and
existing customers.

The dual class structure of our common stock may limit your ability to influence corporate matters and may limit your visibility with respect to
certain transactions.

The dual class structure of our common stock may limit your ability to influence corporate matters. Holders of our common stock are entitled to
one vote per share, while holders of our non-voting common stock are not entitled to any votes. Nonetheless, each share of our non-voting common stock
may be converted at any time into one share of our common stock at the option of its holder by providing written notice to us, subject to the limitations
provided for in our amended and restated certificate of incorporation. Entities affiliated with or managed by Baker Brothers Life Sciences, L.P. and Adage
Capital Partners, LP hold an aggregate of 6,409,519 shares of our non-voting common stock pursuant to our Third Amended and Restated Certificate of
Incorporation. At any time, upon written notice, these entities could convert a portion of these shares of non-voting common stock into up to an aggregate
of 27% of our shares of common stock. Upon 61 days’ prior written notice, these entities could convert all of their respective shares of non-voting common
stock into shares of common stock, which would result in such entities holding approximately 32% of the voting power of our outstanding common stock
following  the  completion  of  our  initial  public  offering.  Consequently,  if  holders  of  our  non-voting  common  stock  exercise  their  option  to  make  this
conversion, this will have the effect of increasing the relative voting power of those prior holders of our non-voting common stock, and correspondingly
decreasing the voting power of the holders of our common stock, which may limit your ability to influence corporate matters. Additionally, stockholders
who  hold,  in  the  aggregate,  more  than  10%  of  our  common  stock  and  non-voting  common  stock,  but  10%  or  less  of  our  common  stock,  and  are  not
otherwise a company insider, may not be required to report changes in their ownership due to transactions in our non-voting common stock pursuant to
Section 16(a) of the Exchange Act, and may not be subject to the short-swing profit provisions of Section 16(b) of the Exchange Act.

A significant portion of our total outstanding shares is restricted from immediate resale but may be sold into the market in the near future,
which could cause the market price of our common stock to decline significantly.

Sales of a substantial number of shares of our common stock in the public market could occur at any time. These sales, upon the expiration of the
lock-up agreements, the early release of these agreements, or the perception in the market that the holders of a large number of shares of common stock
intend to sell shares, could reduce the market price of our common stock.

All shares of common stock not sold in our October 2019 initial public offering will be able to be sold in the public market beginning 180 days

after the date of our initial public offering. The underwriters may, in their sole

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discretion, release all or some portion of the shares subject to lock-up agreements at any time and for any reason. Shares issued upon the exercise of stock
options outstanding under our equity incentive plans or pursuant to future awards granted under those plans will become available for sale in the public
market to the extent permitted by the provisions of applicable vesting schedules, any applicable market standoff and lock-up agreements, and Rule 144 and
Rule 701 under the Securities Act of 1933, as amended, or the Securities Act.

Certain  holders  of  our  common  stock  have  rights,  subject  to  conditions,  to  require  us  to  file  registration  statements  covering  their  shares  or  to
include  their  shares  in  registration  statements  that  we  may  file  for  ourselves  or  other  stockholders.  We  also  filed  a  registration  statement  on  Form  S-8
registering  the  issuance  of  4.5  million  shares  of  common  stock  issued  or  reserved  for  future  issuance  under  our  equity  compensation  plans.  Shares
registered  under  this  registration  statement  on  Form  S-8  can  be  freely  sold  in  the  public  market  upon  issuance  and  once  vested,  subject  to  volume
limitations applicable to affiliates and the lock-up agreements described above. If any of these additional shares are sold, or if it is perceived that they will
be sold, in the public market, the market price of our common stock could decline.

Raising  additional  capital  may  cause  dilution  to  our  existing  stockholders,  restrict  our  operations  or  require  us  to  relinquish  rights  to  our
technologies or product candidates.

We may seek additional capital through a combination of public and private equity offerings, debt financings, strategic partnerships and alliances
and licensing arrangements. To the extent that we raise additional capital through the sale of equity or convertible debt securities, your ownership interest
will be diluted, and the terms may include liquidation or other preferences that adversely affect your rights as a stockholder. The incurrence of indebtedness
would result in increased fixed payment obligations and could involve certain restrictive covenants, such as limitations on our ability to incur additional
debt, limitations on our ability to acquire or license intellectual property rights and other operating restrictions that could adversely impact our ability to
conduct our business. If we raise additional funds through strategic partnerships and alliances and licensing arrangements with third parties, we may have
to relinquish valuable rights to our technologies or product candidates or grant licenses on terms unfavorable to us.

Anti-takeover  provisions  under  our  charter  documents  and  Delaware  law  could  delay  or  prevent  a  change  of  control  which  could  limit  the
market price of our common stock and may prevent or frustrate attempts by our stockholders to replace or remove our current management.

Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that could delay or prevent a change of

control of our company or changes in our board of directors that our stockholders might consider favorable. Some of these provisions include:

•

•

•

•

•

•

a board of directors divided into three classes serving staggered three-year terms, such that not all members of the board will be elected at
one time;

a  prohibition  on  stockholder  action  through  written  consent,  which  requires  that  all  stockholder  actions  be  taken  at  a  meeting  of  our
stockholders;

a requirement that special meetings of stockholders be called only by the chairman of the board of directors, the chief executive officer, or
by a majority of the total number of authorized directors;

advance notice requirements for stockholder proposals and nominations for election to our board of directors;

a requirement that no member of our board of directors may be removed from office by our stockholders except for cause and, in addition
to any other vote required by law, upon the approval of the holders of not less than 75% of the votes that all our stockholders would be
entitled to cast in an annual election of directors;

a requirement of approval of not less than 75% of all outstanding shares of our voting stock to amend any bylaws by stockholder action or
to amend specific provisions of our certificate of incorporation; and

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•

the authority of the board of directors to issue preferred stock on terms determined by the board of directors without stockholder approval
and which preferred stock may include rights superior to the rights of the holders of common stock.

In addition, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporate Law,
which may prohibit certain business combinations with stockholders owning 15% or more of our outstanding voting stock. These anti-takeover provisions
and  other  provisions  in  our  amended  and  restated  certificate  of  incorporation  and  amended  and  restated  bylaws  could  make  it  more  difficult  for
stockholders or potential acquirors to obtain control of our board of directors or initiate actions that are opposed by the then-current board of directors and
could also delay or impede a merger, tender offer or proxy contest involving our company. These provisions could also discourage proxy contests and make
it more difficult for you and other stockholders to elect directors of your choosing or cause us to take other corporate actions you desire. Any delay or
prevention of a change of control transaction or changes in our board of directors could cause the market price of our common stock to decline.

Our amended and restated bylaws designate certain courts as the sole and exclusive forum for certain types of actions and proceedings that
may be initiated by our stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our
directors, officers, or employees.

Pursuant to our amended and restated bylaws, unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the
State of Delaware (or, if the Chancery Court does not have jurisdiction, the federal district court for the District of Delaware or other state courts of the
State of Delaware) will be the sole and exclusive forum for state law claims for: (i) any derivative action or proceeding brought on our behalf; (ii) any
action asserting a claim of breach of a fiduciary duty or other wrongdoing by any of our directors, officers, employees or agents to us or our stockholders;
(iii) any action asserting a claim against us arising pursuant to any provision of the Delaware General Corporation Law or our certificate of incorporation or
bylaws; (iv) any action to interpret, apply, enforce or determine the validity of our certificate of incorporation or bylaws; or (v) any action asserting a claim
governed by the internal affairs doctrine (the Delaware Forum Provision). The Delaware Forum Provision will not apply to any causes of action arising
under the Securities Act of 1933, as amended (the Securities Act) or the Securities Exchange Act of 1934. In addition, our amended and restated bylaws
provide that any person or entity purchasing or otherwise acquiring any interest in shares of our common stock is deemed to have notice of and consented
to the foregoing provisions. We recognize that the forum selection clause in our bylaws may impose additional litigation costs on stockholders in pursuing
any such claims, particularly if the stockholders do not reside in or near the State of Delaware. Additionally, the forum selection clauses in our amended
and restated bylaws may limit our stockholders’ ability to bring a claim in a forum that they find favorable for disputes with us or our directors, officers or
employees, which may discourage such lawsuits against us and our directors, officers and employees even though an action, if successful, might benefit our
stockholders.  The  Court  of  Chancery  of  the  State  of  Delaware  may  also  reach  different  judgments  or  results  than  would  other  courts,  including  courts
where  a  stockholder  considering  an  action  may  be  located  or  would  otherwise  choose  to  bring  the  action,  and  such  judgments  may  be  more  or  less
favorable to us than our stockholders. Alternatively, if a court were to find the choice of forum provision contained in our amended and restated bylaws to
be  inapplicable  or  unenforceable  in  an  action,  we  may  incur  additional  costs  associated  with  resolving  such  action  in  other  jurisdictions,  which  could
materially adversely affect our business, financial condition and operating results.

If securities or industry analysts do not publish research or publish inaccurate or unfavorable research about our business, our stock price and
trading volume could decline.

The trading market for our common stock depends in part on the research and reports that securities or industry analysts publish about us or our
business.  In  the  event  that  one  or  more  of  the  analysts  who  covers  us  downgrades  our  stock  or  publishes  inaccurate  or  unfavorable  research  about  our
business, our stock price may decline. If one or more of these analysts ceases coverage of our company or fails to publish reports on us regularly, demand
for our stock could decrease, which might cause our stock price and trading volume to decline.

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Changes in tax laws could adversely affect our business and financial condition.

The rules dealing with U.S. federal, state, and local income taxation are constantly under review by persons involved in the legislative process and
by the Internal Revenue Service and the U.S. Treasury Department. Changes to tax laws (which changes may have retroactive application) could adversely
affect us or holders of our common stock. In recent years, many such changes have been made and changes are likely to continue to occur in the future. For
example, the Tax Cuts and Jobs Act, or the TCJA, significantly revised the Internal Revenue Code of 1986, as amended, or the Code. The TCJA included,
among other things, a reduction of the corporate tax rate from a top marginal tax rate of 35% to a flat rate of 21%, a limitation of the tax deduction for net
interest expense to 30% of adjusted earnings (except for certain small businesses), a limitation of the deduction for net operating losses to 80% of annual
taxable income for losses arising in taxable years beginning after December 31, 2017 and an elimination of net operating loss carrybacks for losses arising
in taxable years ending after December 31, 2017 (though any such net operating losses may be carried forward indefinitely) and the modification and repeal
of many business deductions and credits, including the reduction of the business tax credit for certain clinical testing expenses incurred in the testing of
certain drugs for rare diseases or conditions generally referred to as “orphan drugs.” Future changes in tax laws could have a material adverse effect on our
business, cash flow, financial condition or results of operations. Prospective investors in our common stock should consult with their legal and tax advisors
with respect to potential changes in tax laws and the tax consequences of investing in or holding our common stock.

Our  ability  to  utilize  our  net  operating  losses  and  certain  other  tax  attributes  to  offset  future  taxable  income  may  be  subject  to  certain
limitations.

As of December 31, 2019, we had U.S. federal, state and local net operating loss carryforwards of $17.5 million, $19.2 million and $10.1 million,
respectively. $0.3 million of the federal amounts expire in 2037. The state net operating losses begin to expire in 2037 and the local net operating losses
expire in 2039. Approximately $17.2 million of the federal net operating losses can be carried forward indefinitely. Certain net operating loss carryforwards
could expire unused and be unavailable to offset future taxable income. In addition, in general, under Sections 382 and 383 of the Code and corresponding
provisions of state law, a corporation that undergoes an “ownership change” is subject to limitations on its ability to utilize its pre-change net operating loss
carryforwards or tax credits, or NOLs or credits, to offset future taxable income or taxes. For these purposes, an ownership change generally occurs where
the aggregate stock ownership of one or more stockholders or groups of stockholders who owns at least 5% of a corporation’s stock increases its ownership
by more than 50 percentage points over its lowest ownership percentage within a specified testing period. Our existing NOLs or credits may be subject to
limitations arising from previous ownership changes, and if we undergo an ownership change, our ability to utilize NOLs or credits could be further limited
by  Sections  382  and  383  of  the  Code.  In  addition,  future  changes  in  our  stock  ownership,  many  of  which  are  outside  of  our  control,  could  result  in  an
ownership change under Sections 382 and 383 of the Code. Our NOLs or credits may also be impaired under state law. Accordingly, we may not be able to
utilize a material portion of our NOLs or credits. Furthermore, our ability to utilize our NOLs or credits is conditioned upon our attaining profitability and
generating U.S. federal and state taxable income. As described above under “—Risks Related to Our Financial Condition and Capital Requirements”, we
have  incurred  significant  net  losses  since  our  inception  and  anticipate  that  we  will  continue  to  incur  significant  losses  for  the  foreseeable  future;  and
therefore, we do not know whether or when we will generate the U.S. federal or state taxable income necessary to utilize our NOLs or credits. Under the
TCJA, net operating loss carryforwards generated in taxable years ending after December 31, 2017 will not be subject to expiration. However, any NOLs
generated in taxable years beginning after December 31, 2017 may only offset 80% of our annual taxable income.

Business interruptions resulting from the coronavirus disease (COVID-19) outbreak or similar public health crises could cause a disruption of
the development of our product candidates and adversely impact our business.

Public  health  crises  such  as  pandemics  or  similar  outbreaks  could  adversely  impact  our  business.  In  December  2019,  a  novel  strain  of  a  virus
named  SARS-CoV-2  (severe  acute  respiratory  syndrome  coronavirus  2),  or  coronavirus,  which  causes  coronavirus  disease,  or  COVID-19,  surfaced  in
Wuhan, China and has reached multiple other regions and countries, including Philadelphia, Pennsylvania where our primary office and laboratory space,
as  well  as  our  manufacturing  partner  Penn,  are  located.    The  coronavirus  pandemic  is  evolving,  and  to  date  has  led  to  the  implementation  of  various
responses, including government-imposed quarantines, travel restrictions and other

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public  health  safety  measures.  The  extent  to  which  the  coronavirus  impacts  our  operations  or  those  of  our  third  party  partners  will  depend  on  future
developments,  which  are  highly  uncertain  and  cannot  be  predicted  with  confidence,  including  the  duration  of  the  outbreak,  new  information  that  will
emerge concerning the severity of the coronavirus and the actions to contain the coronavirus or treat its impact, among others.

Additionally,  timely  enrollment  in  planned  clinical  trials  is  dependent  upon  clinical  trial  sites  which  will  be  adversely  affected  by  global  health
matters,  such  as  pandemics.  We  plan  to  conduct  clinical  trials  for  our  product  candidates  in  geographies  which  are  currently  being  affected  by  the
coronavirus.  Some  factors  from  the  coronavirus  outbreak  that  will  delay  or  otherwise  adversely  affect  enrollment  in  the  clinical  trials  of  our  product
candidates, as well as our business generally, include:

•

•

•

•

the  potential  diversion  of  healthcare  resources  away  from  the  conduct  of  clinical  trials  to  focus  on  pandemic  concerns,  including  the
attention of physicians serving as our clinical trial investigators, hospitals serving as our clinical trial sites and hospital staff supporting the
conduct of our prospective clinical trials;

limitations on travel that could interrupt key trial and business activities, such as clinical trial site initiations and monitoring, domestic and
international  travel  by  employees,  contractors  or  patients  to  clinical  trial  sites,  including  any  government-imposed  travel  restrictions  or
quarantines that will impact the ability or willingness of patients, employees or contractors to travel to our clinical trial sites or secure visas
or entry permissions, a loss of face-to-face meetings and other interactions with potential partners, any of which could delay or adversely
impact the conduct or progress of our prospective clinical trials;

interruption in global shipping affecting the transport of clinical trial materials, such as patient samples, investigational drug product and
conditioning drugs and other supplies used in our prospective clinical trials; and

business disruptions caused by potential workplace, laboratory and office closures and an increased reliance on employees working from
home,  disruptions  to  or  delays  in  ongoing  laboratory  experiments  and  operations,  product  manufacturing  and  supply,  staffing  shortages,
travel limitations or mass transit disruptions, any of which could adversely impact our business operations or delay necessary interactions
with local regulators, ethics committees and other important agencies and contractors.

These and other factors arising from the coronavirus could worsen in countries that are already afflicted with the coronavirus or could continue to
spread to additional countries. Any of these factors, and other factors related to any such disruptions that are unforeseen, could have a material adverse
effect on our business and our results of operation and financial condition.  Further, uncertainty around these and related issues could lead to adverse effects
on  the  economy  of  the  United  States  and  other  economies,  which  could  impact  our  ability  to  raise  the  necessary  capital  needed  to  develop  and
commercialize our product candidates.

Unstable market and economic conditions may have serious adverse consequences on our business, financial condition and stock price.

As widely reported, global credit and financial markets have experienced extreme volatility and disruptions in the past several years, including

severely diminished liquidity and credit availability, declines in consumer confidence, declines in economic growth, increases in unemployment rates and
uncertainty about economic stability. There can be no assurance that further deterioration in credit and financial markets and confidence in economic
conditions will not occur. Our general business strategy may be adversely affected by any such economic downturn, volatile business environment or
continued unpredictable and unstable market conditions. If the current equity and credit markets deteriorate, it may make any necessary debt or equity
financing more difficult, more costly and more dilutive. Failure to secure any necessary financing in a timely manner and on favorable terms could have a
material adverse effect on our growth strategy, financial performance and stock price and could require us to delay or abandon clinical development plans.
In addition, there is a risk that one or more of our current service providers, manufacturers and other partners may not survive an economic downturn,
which could directly affect our ability to attain our operating goals on schedule and on budget.

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Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties.

Our corporate headquarters are located in Philadelphia, PA, where we lease 7,672 square feet of office, research and development space subject to a
lease agreement that is in effect through 2022. We expect to expand to a new space in 2022 that will both be adequate for near-term needs in addition to
providing additional space to grow. We feel that suitable additional research and development, laboratory and manufacturing space should be available in
the region on commercially reasonable terms.

Item 3. Legal Proceedings.

From  time  to  time,  we  may  be  involved  in  lawsuits,  claims,  investigations  and  proceedings,  consisting  of  intellectual  property,  commercial,
employment  and  other  matters  which  arise  in  the  ordinary  course  of  business.  While  the  outcome  of  any  such  proceedings  cannot  be  predicted  with
certainty, as of December 31, 2019, we were not party to any legal proceedings that we would expect to have a material adverse impact on our financial
position, results of operations or cash flow.

Item 4. Mine Safety Disclosures.

Not applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Our common stock trades on The Nasdaq Global Select Market under the symbol “CABA”. Trading of our common stock commenced on October

25, 2019, in connection with our initial public offering, or IPO. Prior to that time, there was no established public trading market for our common stock.

Stockholders

As of March 20, 2020, we had approximately 27 holders of record of our common stock. The actual number of holders of our common stock is
greater than this number of record holders and includes stockholders who are beneficial owners, but whose shares are held in street name by brokers or held
by other nominees. The number of holders of record also does not include stockholders whose shares may be held in trust by other entities.

Dividend Policy

We have never declared or paid any cash dividends on our common stock. We currently intend to retain all available funds and any future earnings,
if any, to fund the development and growth of our business. We do not expect to pay any cash dividends in the foreseeable future. Any future determination
to  pay  dividends  will  be  made  at  the  discretion  of  our  board  of  directors  and  will  depend  on  various  factors,  including  applicable  laws,  our  results  of
operations, financial condition, future prospects, then applicable contractual restrictions and any other factors deemed relevant by our board of directors.
Investors should not purchase our common stock with the expectation of receiving cash dividends.

Equity Compensation Plan

The information required by Item 5 of Form 10-K regarding equity compensation plans is incorporated herein by reference to Item 12 of Part III of

this Annual Report on Form 10-K.

Issuer Purchases of Equity Securities

We did not purchase any of our equity securities during the period covered by this Annual Report on Form 10-K.

Recent Sales of Unregistered Securities

Set forth below is information regarding shares of common stock, shares of our preferred stock issued, and stock options granted and exercised by
us during the period covered by this Annual Report on Form 10-K that were not registered under the Securities Act. Included is the consideration, if any,
we received for such shares and options and information relating to the section of the Securities Act or the Securities and Exchange Commission, under
which  exemption  from  registration  was  claimed.  The  information  presented  in  this  Item  5  gives  effect  to  a  1-for-1.5  reverse  stock  split,  which  became
effective on October 16, 2019.

Issuances of Capital Stock

In January 2019, we issued and sold an aggregate of 6,963,788 shares of our Series B preferred stock to investors for aggregate consideration of
approximately $50.0 million. In addition, we issued a further 1,405,332 shares of Series B Preferred Stock in exchange for 1,405,332 shares of Series A-2
Preferred Stock.

No  underwriters  were  involved  in  the  foregoing  sales  of  securities.  The  sales  of  securities  described  above  were  deemed  to  be  exempt  from
registration pursuant to Section 4(a)(2) of the Securities Act, including Regulation D and Rule 506 promulgated thereunder, as transactions by an issuer not
involving  a  public  offering.  All  of  the  purchasers  in  these  transactions  represented  to  us  in  connection  with  their  purchase  that  they  were  acquiring  the
securities for investment and not distribution, that they could bear the risks of the investment and could hold the securities for an indefinite period of time.
Such purchasers received written disclosures that the securities had not been registered under the Securities Act and that any resale must be made pursuant
to a registration or an available

114

 
exemption from such registration. All of the foregoing securities are deemed restricted securities for the purposes of the Securities Act.

Grants and Exercises of Stock Options under Equity Plans

During  the  period  covered  by  this  Form  10-K,  we  granted  options  to  purchase  an  aggregate  of  988,058  shares  of  common  stock,  with  exercise
prices ranging from $4.23 to $9.54 per share, to directors, employees and consultants pursuant to our 2018 Stock Option and Grant Plan, as amended (the
“2018 Plan”). In 2019, 5,667, shares of common stock were issued upon the exercise of stock options pursuant to the 2018 Plan.

During  the  period  covered  by  this  Form  10-K,  we  granted  options  to  purchase  an  aggregate  of  352,781  shares  of  common  stock,  with  exercise
prices ranging from $7.88 to $11.00 per share, to directors, employees and consultants pursuant to our 2019 Stock Option and Grant Plan, as amended (the
“2019 Plan”). In 2019, no shares of common stock were issued upon the exercise of stock options pursuant to the 2019 Plan.

No underwriters were involved in the foregoing issuance of securities. The issuances of the securities described above were deemed to be exempt
from  registration  pursuant  to  Section  4(a)(2)  of  the  Securities  Act  or  Rule  701  promulgated  under  the  Securities  Act  as  transactions  pursuant  to
compensatory benefit plans. The shares of common stock issued upon the exercise of options are deemed to be restricted securities. All recipients either
received adequate information about us or had access, through employment or other relationships, to such information.

Use of Proceeds from the Initial Public Offering

On October 29, 2019, we closed our initial public offering, or IPO, in which we issued and sold 7,275,501 shares of common stock at a public
offering price of $11.00 per share, including 475,501 shares of common stock at a price of $11.00 per share pursuant to the exercise of the underwriters’
over-allotment option. All of the shares of common stock issued and sold in our initial public offering were registered under the Securities Act pursuant to a
registration statement on Form S-1 (Registration No. 333-234017), which was declared effective by the SEC on October 24, 2019. Morgan Stanley & Co.
LLC, Cowen and Company and Evercore Group L.L.C. acted as joint book-running managers for the offering.

The  aggregate  net  proceeds  to  us  from  the  public  offering,  inclusive  of  the  over-allotment  exercise,  were  approximately  $71.0  million,  after
deducting underwriting discounts and commissions and other offering expenses payable by us of approximately $3.4 million. No offering expenses were
paid directly or indirectly to any of our directors or officers (or their associates) or persons owning 10% or more of any class of our equity securities or to
any other affiliates.

Information  related  to  use  of  proceeds  from  registered  securities  is  incorporated  herein  by  reference  to  the  “Use  of  Proceeds”  section  of  the
Company’s final prospectus related to the IPO. The amounts and timing of our actual expenditures may vary significantly depending on numerous factors,
including the progress of our research and development, the status of and results from non-clinical studies or clinical trials we may commence in the future,
as well as any collaborations that we may enter into with third parties for our product candidates or strategic opportunities that become available to us, and
any unforeseen cash needs. As a result, our management will retain broad discretion over the allocation of the net proceeds from this offering. There has
been no material change in the planned use of proceeds from our IPO as described in our final prospectus. As of December 31, 2019, we have not used any
of the net proceeds from our initial public offering.  

115

 
Item 6. Selected Financial Data.

Information requested by this Item is not applicable as we are electing scaled disclosure requirements available to Smaller Reporting Companies

with respect to this Item.

116

 
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

You  should  read  the  following  discussion  and  analysis  of  our  financial  condition  and  results  of  operations  together  with  the  section  entitled
“Selected Financial Information” and our financial statements and related notes appearing elsewhere in this Annual Report on Form 10-K, or this Annual
Report. Some of the information contained in this discussion and analysis or set forth elsewhere in this Annual Report, including information with respect
to our plans and strategy for our business and related financing, includes forward-looking statements that involve risks and uncertainties. As a result of
many factors, including those factors set forth in the section entitled “Risk Factors,” our actual results could differ materially from the results described in
or  implied  by  the  forward-looking  statements  contained  in  the  following  discussion  and  analysis.  You  should  carefully  read  the  section  entitled  “Risk
Factors” to gain an understanding of the important factors that could cause actual results to differ materially from our forward-looking statements. Please
also  see  the  section  entitled  “Special  Note  Regarding  Forward-Looking  Statements.”  We  do  not  assume  any  obligation  to  update  any  forward-looking
statements, whether as a result of new information, future events or otherwise, except as required by law.

Overview

We  are  a  clinical-stage  biotechnology  company  focused  on  the  discovery  and  development  of  engineered  T  cell  therapies  for  B  cell-mediated
autoimmune diseases. Our proprietary technology utilizes CAAR T cells that are designed to selectively bind and eliminate B cells that produce disease-
causing autoantibodies, or pathogenic B cells, while sparing normal B cells. Our lead CAAR T cell product candidate was designed based on or CAR T cell
technology that has been successfully developed and is marketed for the treatment of B cell cancers. We believe our technology, in combination with our
proprietary Cabaletta Approach for selective B cell Ablation platform, called our CABA platform, has applicability across over two dozen B cell-mediated
autoimmune diseases that we have identified, reviewed and prioritized. In order to accelerate product development for our lead program and to access a
proven cell therapy manufacturing platform, we have entered into a collaboration with the Trustees of the University of Pennsylvania, or Penn. We hold
multiple  agreements  with  Penn  to  develop  CAAR  T  cell  therapies  for  the  treatment  of  these  diseases.  Our  goal  is  to  leverage  our  team’s  expertise  in
autoimmunity and engineered T cell therapy and our collaboration with Penn to rapidly discover and develop our portfolio of CAAR T product candidates.
Our initial focus is on pemphigus vulgaris, or PV, which is an autoimmune blistering skin disease. We submitted an IND to the FDA in August 2019. Our
IND was cleared in September 2019, and we plan to initiate our DesCAARTesTM Trial in 2020. In January 2020, the FDA granted DSG3-CAART orphan
drug designation for the treatment of PV. We are also advancing additional product candidates currently in discovery-stage or preclinical development for
the treatment of muscle-specific kinase myasthenia gravis, or MuSK MG, mucocutaneous PV, or mcPV, and Hemophilia A with FVIII alloantibodies.

We were incorporated in April 2017. In August 2018, we entered into multiple agreements with Penn to develop the CAAR T technology to treat
B cell-mediated autoimmune diseases. Our operations to date have been financed primarily by net proceeds of $86.4 million from the sale of convertible
notes and convertible preferred stock and net proceeds of $71.0 million from the sale of common stock in our initial public offering, or IPO, in October
2019. As of December 31, 2019, we had $136.2 million in cash and cash equivalents.

Amended and Restated License Agreement with the Trustees of the University of Pennsylvania and the Children’s Hospital of Philadelphia

In August 2018, we entered into a license agreement with Penn, which was amended and restated in July 2019 to include the Children’s Hospital of
Philadelphia, or CHOP, collectively, the Institutions, and collectively with such amendment, the License Agreement, pursuant to which we obtained (a) a
non-exclusive, non-sublicensable, worldwide research license to make, have made and use products in two subfields of use, (b) effective as of October
2018, an exclusive, worldwide, royalty-bearing license, with the right to sublicense, under certain of the Institutions’ intellectual property to make, use, sell,
offer  for  sale  and  import  products  in  the  same  two  subfields  of  use,  and  (c)  effective  as  of  October  2018,  a  non-exclusive,  worldwide,  royalty-bearing
license,  with  limited  rights  to  sublicense,  under  certain  of  Penn’s  know-how  to  make,  have  made,  use,  sell,  offer  for  sale,  import  and  have  imported
products in the same two subfields of use. Our rights are subject to the rights of the U.S. government and certain rights retained by the Institutions.

117

Unless earlier terminated, the License Agreement will expire with respect to a product upon the later of (a) the expiration of the last to expire patent
or patent application covering such product or (b) 10 years after the first commercial sale of such product. We may terminate the License Agreement in its
entirety or on a subfield-by-subfield basis at any time for convenience upon a certain number of days’ prior written notice. Penn may terminate the License
Agreement in its entirety or on a subfield-by-subfield basis for our uncured material breach, including for our failure to meet certain diligence obligations
and milestone events. We, however, may extend the achievement date of any milestone event for an additional period of time by making a payment in a
certain amount, subject to certain limitations in the number of times each event may be extended.

Sponsored Research Agreements

We have two sponsored research agreements with Penn for the laboratories of Drs. Payne and Milone, who are also our scientific co-founders and
members of our scientific advisory board. Under these agreements, we are committed to funding a defined research plan for three years through April 2021.
The total estimated three-year cost of the two agreements is $8.5 million, which satisfies the $2.0 million annual obligation under the License Agreement.

Master Translational Research Services Agreement

In October 2018, we entered into a services agreement with Penn, or the Services Agreement, pursuant to which Penn agreed to perform certain
services related to the research and development of the technology licensed to us under the License Agreement, as well as certain clinical, regulatory and
manufacturing  services.  The  research  and  development  activities  are  detailed  in  Penn  organization-specific  addenda  that  are  separately  executed.  The
Services Agreement will expire on the later of (i) October 19, 2021 or (ii) completion of the services for which we have engaged Penn under the Services
Agreement.

Components of Operating Results

Revenue

To date, we have not generated any revenue from product sales and do not expect to generate any revenue from the sales of products for several
years, if at all. If our development efforts for our current or future product candidates are successful and result in marketing approval, we may generate
revenue in the future from product sales. We cannot predict if, when or to what extent we will generate revenue from the commercialization and sale of our
product candidates. We may never succeed in obtaining regulatory approval for any of our product candidates.

We may also in the future enter into license or collaboration agreements for our product candidates or intellectual property, and we may generate

revenue in the future from payments as a result of such license or collaboration agreements.

Operating Expenses

Research and Development

Our research and development expenses include:

•

•

•

•

•

personnel costs, which include salaries, benefits and stock-based compensation expense;

expenses incurred under agreements with consultants, third-party contract organizations that conduct research and development activities
on our behalf;

costs related to sponsored research service agreements;

costs related to production of preclinical and clinical materials, including fees paid to contract manufacturers;

licensing fees for intellectual property and know-how;

118

 
 
 
 
 
•

•

laboratory and vendor expenses related to the execution of preclinical studies and planned clinical trials; and

laboratory supplies and equipment used for internal research and development activities.

We have not reported program costs since inception because historically we have not tracked or recorded our research and development expenses
on  a  pre-clinical  program-by-program  basis.  We  use  our  personnel  and  infrastructure  resources  across  the  breadth  of  our  research  and  development
activities, which are directed toward identifying and developing product candidates.

We expense all research and development costs in the periods in which they are incurred. Costs for certain research and development activities are
recognized based on an evaluation of the progress to completion of specific tasks using information and data provided to us by Penn, our vendors and third-
party service providers.

We  expect  our  research  and  development  expenses  to  increase  substantially  for  the  foreseeable  future  as  we  continue  to  invest  in  research  and
development  activities  related  to  developing  our  product  candidates,  including  investments  in  manufacturing,  as  our  programs  advance  and  we  conduct
clinical  trials.  The  process  of  conducting  the  necessary  clinical  research  to  obtain  regulatory  approval  is  costly  and  time-consuming,  and  the  successful
development of our product candidates is highly uncertain. As a result, we are unable to determine the duration and completion costs of our research and
development projects or when and to what extent we will generate revenue from the commercialization and sale of any of our product candidates.

Because  of  the  numerous  risks  and  uncertainties  associated  with  product  development,  we  cannot  determine  with  certainty  the  duration  and
completion  costs  of  the  current  or  future  preclinical  studies  and  clinical  trials  or  if,  when,  or  to  what  extent  we  will  generate  revenues  from  the
commercialization and sale of our product candidates. We may never succeed in achieving regulatory approval for our product candidates. The duration,
costs and timing of preclinical studies and clinical trials and development of our product candidates will depend on a variety of factors, including:

•

•

•

•

•

•

•

•

•

•

•

•

•

successful completion of preclinical studies and IND-enabling studies;

development of chemistry, manufacturing and controls, or CMC, processes and procedures for purposes of IND applications;

successful patient enrollment in, and the initiation and completion of, clinical trials;

the  impact  of  any  business  interruptions  to  our  operations  or  to  those  of  our  clinical  sites,  manufacturers,  suppliers,  or  other  vendors
resulting from the coronavirus disease (COVID-19) outbreak or similar public health crisis;

receipt of regulatory approvals from applicable regulatory authorities;

establishing commercial manufacturing capabilities or arrangements with third-party manufacturers;

obtaining and maintaining patent and trade secret protection and non-patent exclusivity;

launching commercial sales of our product candidates, if and when approved, whether alone or in collaboration with others;

acceptance of our product candidates, if and when approved, by patients, the medical community and third-party payors;

effectively competing with other therapies and treatment options;

a continued acceptable safety and efficacy profile following approval;

enforcing and defending intellectual property and proprietary rights and claims; and

achieving desirable medicinal properties for the intended indications.

119

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
We may never succeed in achieving regulatory approval for any of our product candidates. We may obtain unexpected results from our preclinical
studies  and  clinical  trials.  We  may  elect  to  discontinue,  delay  or  modify  clinical  trials  of  some  product  candidates  or  focus  on  others.  A  change  in  the
outcome  of  any  of  these  factors  could  mean  a  significant  change  in  the  costs  and  timing  associated  with  the  development  of  our  current  and  future
preclinical and clinical product candidates. For example, if the FDA or another regulatory authority, were to require us to conduct clinical trials beyond
those  that  we  currently  anticipate  will  be  required  for  the  completion  of  clinical  development,  or  if  we  experience  significant  delays  in  execution  of  or
enrollment  in  any  of  our  preclinical  studies  or  clinical  trials,  we  could  be  required  to  expend  significant  additional  financial  resources  and  time  on  the
completion of preclinical and clinical development. We expect our research and development expenses to increase for the foreseeable future as we continue
the development of product candidates.

General and Administrative Expenses

Our  general  and  administrative  expenses  consist  primarily  of  personnel  costs,  costs  related  to  maintenance  and  filing  of  intellectual  property,
depreciation expense and other expenses for outside professional services, including legal, human resources, audit and accounting services. Personnel costs
consist of salaries, benefits and stock-based compensation expense. We expect our general and administrative expenses to increase over the next several
years  to  support  our  continued  research  and  development  activities,  manufacturing  activities,  increased  costs  of  operating  as  a  public  company  and  the
potential commercialization of our product candidates. We anticipate our general and administrative costs will increase and with respect to the hiring of
additional personnel, developing commercial infrastructure, fees to outside consultants, lawyers and accountants, and increased costs associated with being
a public company such as expenses related to services associated with maintaining compliance with Nasdaq listing rules and SEC requirements, insurance
and investor relations costs.

Other Income and (Expense)

Our  other  income  and  (expense)  includes  (i)  interest  income  earned  on  money-market  fund  cash  equivalents;  and  (ii)  fair  value  adjustments  on

convertible notes for which we have elected the fair value option of accounting.

Results of Operations for the years ended December 31, 2019 and 2018

The following sets forth our results of operations:

Statements of Operations Data:
Operating expenses:

Research and development
General and administrative

Total operating expenses
Loss from operations
Other income and (expense):

Interest income
Fair value adjustments on convertible notes

Net loss

Year Ended December 31,

2019

2018
(in thousands)

Change

11,671    $
7,012   
18,683   
(18,683)  

1,740   
—   
(16,943)   $

4,467    $
1,726   
6,193   
(6,193)  

235   
(6,244)  
(12,202)   $

7,204 
5,286 
12,490 
(12,490)

1,505 
6,244 
(4,741)

  $

  $

120

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
   
   
 
  
 
 
    
   
   
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
   
   
 
  
 
 
 
 
 
 
 
 
 
Research and Development Expenses

Research and development expenses were $11.7 million for the year ended December 31, 2019 as compared to $4.5 million for the year ended

December 31, 2018. The table below summarizes our research and development expenses:

Sponsored research activities
License of intellectual property and subscription fee
Manufacturing of preclinical and clinical supplies
Clinical trials
Personnel
Development services
Other

Year Ended December 31,

2019

2018
(in thousands)

Change

  $

  $

2,228    $
292   
2,686   
441   
4,006   
1,796   
222   
11,671    $

1,985    $
1,155   
722   
—   
541   
54   
10   
4,467    $

243 
(863)
1,964 
441 
3,465 
1,742 
212 
7,204

Specific changes in our research and development expenses period-on-period include a:

•

•

•

•

•

$3.5 million increase in personnel costs due to the hiring of additional research and development staff during 2019, including $0.8 million
of stock-based compensation expense;

$2.0 million increase for manufacturing of preclinical and clinical supplies in anticipation of the planned DesCAARTesTM Trial;

$1.7 million increase in development services from the commencement of preclinical research;

$0.4 million increase in clinical trial work from the initial start-up costs of the planned DesCAARTesTM Trial; and

$0.9 million decrease for intellectual property license expense principally resulting from the one-time license fee in September 2018.

General and Administrative Expenses

General  and  administrative  expenses  were  $7.0  million  for  the  year  ended  December  31,  2019  as  compared  to  $1.7  million  for  the  year  ended

December 31, 2018. The increase of $5.3 million in our general and administrative expenses period-on-period includes:

•

•

•

$2.8 million additional personnel costs due to the hiring of additional general and administrative employees in 2019, including an increase
of $0.8 million of stock-based compensation expense;

$1.1 million of additional services, including legal, audit and accounting, public relations, recruiting and other consulting fees; and

$1.4 million increase in other general and administrative expenses including rent, insurance and other costs associated with being a public
company.

Other Income and (Expense)

Interest income has increased $1.5 million for the year ended December 31, 2019 as compared to the year ended December 31, 2018 due to our
higher balance of cash and cash equivalents as a result of proceeds received from our issuances of our convertible notes in May 2018, convertible preferred
stock  in  October  2018  and  January  2019  and  common  stock  in  October  2019.  Other  expense  of  $6.2  million  for  the  year  ended  December  31,  2018  is
comprised of fair value adjustments to our convertible notes.

121

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Liquidity and Capital Resources

Since our inception in April 2017 through December 31, 2019, our operations have been financed by proceeds of $86.4 million from the sale of
convertible notes and our convertible preferred stock and proceeds of $71.0 million from the sale of common stock in our initial public offering. As of
December 31, 2019, we had $136.2 million in cash and cash equivalents. Cash in excess of immediate requirements is invested in accordance with our
investment policy, primarily with a view to liquidity and capital preservation.

We have incurred losses since our inception and, as of December 31, 2019, we had an accumulated deficit of $33.0 million. Our primary use of
cash is to fund operating expenses, which consist primarily of research and development expenditures, and to a lesser extent, general and administrative
expenditures. Cash used to fund operating expenses is impacted by the timing of when we pay these expenses, as reflected in the change in our outstanding
prepaid expenses and other current assets, accounts payable and accrued expenses.

Any  product  candidates  we  may  develop  may  never  achieve  commercialization  and  we  anticipate  that  we  will  continue  to  incur  losses  for  the
foreseeable future. We expect that our research and development expenses, general and administrative expenses, and capital expenditures will continue to
increase. As a result, until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through a combination of
equity offerings, debt financings or other capital sources, including potentially collaborations, licenses and other similar arrangements. Our primary uses of
capital are, and we expect will continue to be, compensation and related expenses, third-party clinical research, manufacturing and development services,
costs  relating  to  the  build-out  of  our  headquarters,  laboratories  and  manufacturing  facility,  license  payments  or  milestone  obligations  that  may  arise,
laboratory and related supplies, clinical costs, manufacturing costs, legal and other regulatory expenses and general overhead costs.

Based upon our current operating plan, we believe that our existing cash and cash equivalents as of December 31, 2019 will enable us to fund our
operating expenses and capital expenditure requirements through at least the third quarter of 2022. We have based this estimate on assumptions that may
prove to be wrong, and we could utilize our available capital resources sooner than we currently expect. We will continue to require additional financing to
advance  our  current  product  candidates  through  clinical  development,  to  develop,  acquire  or  in-license  other  potential  product  candidates  and  to  fund
operations for the foreseeable future. We will continue to seek funds through equity offerings, debt financings or other capital sources, including potentially
collaborations, licenses and other similar arrangements. However, we may be unable to raise additional funds or enter into such other arrangements when
needed  on  favorable  terms  or  at  all.  If  we  do  raise  additional  capital  through  public  or  private  equity  offerings,  the  ownership  interest  of  our  existing
stockholders will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect our stockholders’ rights. If
we  raise  additional  capital  through  debt  financing,  we  may  be  subject  to  covenants  limiting  or  restricting  our  ability  to  take  specific  actions,  such  as
incurring additional debt, making capital expenditures or declaring dividends. Any failure to raise capital as and when needed could have a negative impact
on our financial condition and on our ability to pursue our business plans and strategies. If we are unable to raise capital, we will need to delay, reduce or
terminate planned activities to reduce costs.

Because of the numerous risks and uncertainties associated with research, development and commercialization of pharmaceutical products, we are
unable to estimate the exact amount of our operating capital requirements. Our future funding requirements will depend on many factors, including, but not
limited to:

•

•

•

•

the  scope,  progress,  results  and  costs  of  researching,  developing  and  manufacturing  our  lead  product  candidates  or  any  future  product
candidates, and conducting preclinical studies and clinical trials;

the timing of, and the costs involved in, obtaining regulatory approvals or clearances for our lead product candidates or any future product
candidates;

the  impact  of  any  business  interruptions  to  our  operations  or  to  those  of  our  clinical  sites,  manufacturers,  suppliers,  or  other  vendors
resulting from the coronavirus disease (COVID-19) outbreak or similar public health crisis;

the number and characteristics of any additional product candidates we develop or acquire;

122

 
 
 
 
•

•

•

•

•

•

the timing of any cash milestone payments if we successfully achieve certain predetermined milestones;

the cost of manufacturing our lead product candidate or any future product candidates and any products we successfully commercialize,
including costs associated with building-out our manufacturing capabilities;

our  ability  to  establish  and  maintain  strategic  collaborations,  licensing  or  other  arrangements  and  the  financial  terms  of  any  such
agreements that we may enter into;

the expenses needed to attract and retain skilled personnel;

the costs associated with being a public company; and

the timing, receipt and amount of sales of any future approved or cleared products, if any.

Further, our operating plans may change, and we may need additional funds to meet operational needs and capital requirements for clinical trials
and other research and development activities. We currently have no credit facility or committed sources of capital. Because of the numerous risks and
uncertainties associated with the development and commercialization of our product candidates, we are unable to estimate the amounts of increased capital
outlays and operating expenditures associated with our current and anticipated product development programs.

Cash Flows

The following table summarizes our cash flows for the periods indicated:

Net cash provided by (used in):

Operating activities
Investing activities
Financing activities

Net increase in cash and cash equivalents

Operating Activities

Year Ended December 31,

2019

2018

(in thousands)

$

$

(16,045)  
(693)  
119,925   
103,187   

$

$

(4,661)
— 
37,677 
33,016

The use of cash in all periods resulted primarily from our net losses adjusted for non-cash charges and changes in components of working capital.

During  the  year  ended  December  31,  2019,  cash  used  in  operating  activities  of  $16.0  million  was  attributable  to  our  net  loss  of  $16.9  million,
increased  by  the  net  change  of  $1.5  million  in  our  net  operating  assets  and  liabilities  and  offset  by  non-cash  charges  of  $2.4  million  for  stock-based
compensation charges and depreciation.

During  the  year  ended  December  31,  2018,  cash  used  in  operating  activities  of  $4.7  million  was  attributable  to  our  net  loss  of  $12.2  million,
increased by the net change of $0.5 million in our net operating assets and liabilities and offset by non-cash charges of $8.0 million for changes in fair value
of our convertible notes, common stock issued for the Penn license and stock-based compensation charges.

Investing Activities

During the year ended December 31, 2019, we used $0.7 million of cash and cash equivalents in investing activities consisting of purchases of

property and equipment. We had no investing activities during the year ended December 31, 2018.

123

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
   
 
 
 
 
 
 
 
 
 
 
 
Financing Activities

During the year ended December 31, 2019, cash provided by financing activities of $119.9 million was attributable to $48.7 million of net proceeds
upon the issuance of Series B convertible preferred stock in January 2019 and $71.2 million of net proceeds from the issuance of common stock in our
initial public offering in October 2019.

During the year ended December 31, 2018, cash provided by financing activities of $37.7 million was comprised of $12.5 million of proceeds upon
the issuance of convertible notes in May 2018, $12.6 million of proceeds on the milestone closing of the convertible notes and issuance of our Series A-1
convertible preferred stock in October 2018, and $12.6 million net proceeds upon the issuance of our Series A convertible preferred stock in October 2018.

Contractual Obligations and Commitments

In February 2019, we entered into an operating lease agreement for new office space in Philadelphia, Pennsylvania. The lease term commenced in
May 2019 and will expire in July 2022. The initial annual base rent is $0.3 million, and such amount will increase by 2% annually on each anniversary of
the commencement date.

Our commitments include:

•

•

•

The License Agreement. Under the License Agreement, we are required to make milestone payments upon successful completion of certain
development, regulatory and sales milestones on a product-by-product and geographical basis. The payment obligations under the License
Agreement  are  contingent  upon  future  events  such  as  our  achievement  of  specified  development,  regulatory  and  commercial  milestones
and we will be required to make development milestone payments and royalty payments in connection with the sale of products developed
under the License Agreement. As of December 31, 2019, we are unable to estimate the timing or likelihood of achieving the milestones or
making future product sales. We are also obligated to pay $2.0 million annually for three years beginning August 2018 for funding to the
laboratories of Drs. Payne and Milone.

Under  the  License  Agreement,  we  must  use  commercially  reasonable  efforts  to  develop  and  commercialize  a  product  in  each  subfield.
During  the  term  of  the  License  Agreement  until  the  first  commercial  sale  of  the  first  product,  we  are  obligated  to  pay  Penn  a  non-
refundable,  non-creditable  annual  license  maintenance  fee  of  $10,000.  We  are  required  to  pay  certain  milestone  payments  upon  the
achievement  of  specified  clinical  and  commercial  milestones.  Milestone  payments  are  reduced  by  a  certain  percentage  for  the  second
product  that  achieves  a  milestone,  by  an  additional  percentage  for  the  third  product  that  achieves  a  milestone,  and  so  on,  for  each
subsequent product that achieves a milestone. In the event that we are able to successfully develop and launch multiple products under the
License Agreement, total milestone payments could approach $20.0 million. Penn is also eligible to receive tiered royalties at percentage
rates  in  the  low  single-digits,  subject  to  an  annual  minimum  royalty,  on  annual  worldwide  net  sales  of  any  products  that  are
commercialized by us or our sublicensees that contain or incorporate, or are covered by, the intellectual property licensed by us. To the
extent  we  sublicense  our  license  rights  under  the  License  Agreement,  Penn  would  be  eligible  to  receive  tiered  sublicense  income  at
percentage rates in the mid-single to low double-digits. We have also entered into a subscription and technology transfer agreement with
Penn, pursuant to which we owed Penn an upfront subscription fee, which was paid in 2019, and a nominal non-refundable royalty on net
sales of products, a portion of which will be credited toward milestone payments and royalties under this License Agreement. Technology
transfer activities would be at our cost and subject to agreement as to the technology to be transferred.

Master Translational Research Services Agreement with Penn. Under the Services Agreement, we have contracted for additional research
and development services from various laboratories within Penn. The Services Agreement will expire on the later of (i) October 19, 2021
or (ii) completion of the services for which we have engaged Penn under the Services Agreement. We may incur up to $900 through the
remaining  term  of  the  Addendum  in  2020  related  to  the  manufacture  of  vector  under  the  Center  for  Advanced  Retinal  and  Ocular
Therapeutics, or CAROT, addendum.

Sponsored Research Agreements. We have two sponsored research agreements, or SRAs, with Penn for the laboratories of our scientific co-
founders Drs. Payne and Milone. Under the SRAs, we have

124

 
 
 
committed to funding a defined research plan for three years through April 2021. We have estimated the three-year cost of the two SRAs to
be $8.5 million, which satisfies the $2.0 million annual obligation under the License Agreement.

•

•

Manufacturing agreements. Under agreement with a manufacturer, we are progressing a staged plan for vector development and may incur
up to $1,300 in committed spend.

Other  Purchase  Commitments.  In  the  normal  course  of  business,  we  enter  into  various  purchase  commitments  with  third-party  contract
manufacturers  for  the  manufacture  and  processing  of  our  product  candidates  and  related  raw  materials,  contracts  with  contract  research
organizations  for  clinical  trials  and  agreements  with  vendors  for  other  services  and  products  for  operating  purposes.  These  agreements
generally provide for termination or cancellation other than for costs already incurred.

Off-Balance Sheet Arrangements

During the periods presented, we did not have, nor do we currently have, any off-balance sheet arrangements as defined under SEC rules.

Critical Accounting Policies and Significant Judgments and Estimates

Our management’s discussion and analysis of our financial condition and results of operations is based on our financial statements, which have
been prepared in accordance with generally accepted accounting principles, or GAAP. The preparation of these financial statements requires us to make
estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the
financial statements, as well as the reported expenses incurred during the reporting periods. Our estimates are based on our historical experience and on
various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying
value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or
conditions. We believe that the accounting policies discussed below are critical to understanding our historical and future performance, as these policies
relate to the more significant areas involving management’s judgments and estimates.

While our significant accounting policies are described in more detail in Note 2 to our financial statements appearing elsewhere in this Annual
Report, we believe that the following accounting policies are those most critical to the judgments and estimates used in the preparation of our financial
statements.

Research and Development Costs

We estimate costs of research and development activities conducted by service providers, which include activities under the License Agreement,
the conduct of sponsored research, preclinical studies and contract manufacturing activities. We record the estimated costs of research and development
activities based upon the estimated amount of services provided and include these costs in the accrued and other current liabilities or prepaid expenses on
the balance sheets and within research and development expense on the statements of operations.

We  estimate  these  costs  based  on  factors  such  as  estimates  of  the  work  completed  and  budget  provided  and  in  accordance  with  agreements
established  with  our  collaboration  partners  and  third-party  service  providers.  We  make  significant  judgments  and  estimates  in  determining  the  accrued
liabilities and prepaid expense balances in each reporting period. As actual costs become known, we adjust our accrued liabilities or prepaid expenses. We
have not experienced any material differences between accrued costs and actual costs incurred since our inception.

Stock-based Compensation

We recognize compensation costs related to stock-based awards, including stock options and non-vested stock, based on the estimated fair value of
the awards on the date of grant. We estimate the grant date fair value, and the resulting stock-based compensation, using the Black-Scholes option-pricing
model, or Black-Scholes. The grant

125

 
 
 
date fair value of the stock-based awards is generally recognized on a straight-line basis over the requisite service period, which is generally the vesting
period of the respective awards.

Black-Scholes requires the use of subjective assumptions to determine the fair value of stock-based awards. These assumptions include:

•

•

•

•

•

Fair Value of Common Stock—Historically, for all periods prior to our initial public offering in October 2019, the fair value of the shares of
common stock underlying our stock-based awards was estimated on each grant date by our board of directors. In order to determine the fair
value of our common stock underlying option grants, our board of directors considered, among other things, valuations of our common
stock prepared by an unrelated third-party valuation firm in accordance with the guidance provided by the American Institute of Certified
Public Accountants Practice Guide, Valuation of Privately-Held-Company Equity Securities Issued as Compensation, or the Practice Aid.

Expected Term—The expected term represents the period that stock-based awards are expected to be outstanding. The expected term for
option grants is determined using the simplified method. The simplified method deems the expected term to be the midpoint between the
vesting date and the contractual life of the stock-based awards.

Expected Volatility— As a privately held company historically, the Company has limited trading history for its common stock and, as such,
the expected volatility is estimated based on the average volatility for comparable publicly traded biotechnology companies over a period
equal to the expected term of the stock option grants. The comparable companies were chosen based on their similar size, stage in the life
cycle or area of specialty. We will continue to apply this process until a sufficient amount of historical information regarding the volatility
of our own stock price becomes available.

Risk-Free  Interest  Rate—The  risk-free  interest  rate  is  based  on  the  U.S.  Treasury  zero  coupon  issues  in  effect  at  the  time  of  grant  for
periods corresponding with the expected term of option.

Expected  Dividend—We  have  never  paid  dividends  on  our  common  stock  and  have  no  plans  to  pay  dividends  on  our  common  stock.
Therefore, we use an expected dividend yield of zero.

We will continue to use judgment in evaluating the assumptions utilized for our stock-based compensation expense calculations on a prospective
basis.  In  addition  to  the  assumptions  used  in  Black-Scholes,  the  amount  of  stock-based  compensation  expense  we  recognize  in  our  financial  statements
includes stock option forfeitures as they occurred.  

Determination of the Fair Value of Convertible Notes

We have elected the fair value option for the accounting for our convertible notes issued in 2018. Fair value adjustments to the convertible notes are
included in our other income and (expenses). The fair value of the initial closing of our convertible notes in May 2018 was determined to be equal to the
proceeds  of  $12.5  million  on  issuance.  The  fair  value  of  the  convertible  notes  on  conversion  and  of  the  milestone-based  closing  in  October  2018  was
determined to be equal to the value of our Series A-1 convertible preferred stock and Series A-2 convertible preferred stock into which the convertible
notes were converted, which was determined to be $3.39 per share of Series A-1 convertible preferred stock and Series A-2 convertible preferred stock,
using an OPM framework and utilized the back-solve method for inferring and allocating the equity value predicated on the concurrent sale of Series A
convertible  preferred  stock.  This  method  was  selected  as  we  concluded  that  the  sale  of  the  Series  A  convertible  preferred  stock  was  an  arm’s-
length transaction. Application of the OPM back-solve method involves making assumptions for the expected time to liquidity, volatility and risk-free rate
and then solving for the value of equity such that value for the most recent financing equals the amount paid. The OPM allocation of total equity value was
determined with reference to a recent financing transaction and we assumed a 71% volatility rate, a 1.3-year estimated term and a probability weighted
average discount for lack of marketability of 35%. All outstanding convertible notes converted to convertible preferred stock in October 2018. There were
no convertible notes outstanding as of December 31, 2019 and 2018.

126

 
 
 
 
 
Emerging Growth Company Status

We are an emerging growth company, as defined in the JOBS Act. Under the JOBS Act, emerging growth companies can delay adopting new or
revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. Section
107 of the JOBS Act provides that an emerging growth company may take advantage of the extended transition period provided in Section 7(a)(2)(B) of the
Securities Act of 1933 for complying with new or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as
those standards apply to private companies. Section 107 of the JOBS Act provides that we can elect to opt out of the extended transition period at any time,
which election is irrevocable. We have elected to use this extended transition period for complying with new or revised accounting standards that have
different effective dates for public and private companies until the earlier of the date we (i) are no longer an emerging growth company or (ii) affirmatively
and  irrevocably  opt  out  of  the  extended  transition  period  provided  in  the  JOBS  Act.  As  a  result,  our  financial  statements  may  not  be  comparable  to
companies that comply with new or revised accounting pronouncements as of public company effective dates.

Subject  to  certain  conditions,  as  an  emerging  growth  company,  we  may  rely  on  certain  other  exemptions  and  reduced  reporting  requirements,
including  without  limitation  (i)  providing  an  auditor’s  attestation  report  on  our  system  of  internal  controls  over  financial  reporting  pursuant  to  Section
404(b)  of  the  Sarbanes-Oxley  Act  and  (ii)  complying  with  any  requirement  that  may  be  adopted  by  the  Public  Company  Accounting  Oversight  Board
regarding  mandatory  audit  firm  rotation  or  a  supplement  to  the  auditor’s  report  providing  additional  information  about  the  audit  and  the  consolidated
financial statements, known as the auditor discussion and analysis. We will remain an emerging growth company until the earlier of (a) the last day of the
fiscal year in which we have total annual gross revenue of $1.07 billion or more; (b) the last day of the fiscal year following the fifth anniversary of the date
of the completion of our initial public offering; (c) the date on which we have issued more than $1.0 billion in nonconvertible debt during the previous
three years; or (d) the date on which we are deemed to be a large accelerated filer under the rules of the SEC.

Recently Issued Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board, or the FASB, issued ASU 2016-02, Leases (Topic 842), with guidance regarding the
accounting for and disclosure of leases. The update requires lessees to recognize the liabilities related all leases, including operating leases, with a term
greater than 12 months on the balance sheet. This update also requires lessees and lessors to disclose key information about their leasing transactions. This
guidance  was  effective  for  public  companies  for  annual  and  interim  periods  beginning  after  December  15,  2018.  For  all  other  entities  this  standard  is
effective for annual reporting periods beginning after December 15, 2020, and interim periods within annual periods beginning after December 15, 2021.
Early adoption is permitted. We will adopt Topic 842 for our annual period ending December 31, 2021, and we have yet to evaluate the effect that ASU
2016-02 will have on our financial statements or financial statement disclosures.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

Interest Rate Risk

We  are  exposed  to  market  risks  in  the  ordinary  course  of  our  business.  These  risks  primarily  include  interest  rate  sensitivities.  We  held  cash  and  cash
equivalents of $136.2 million as of December 31, 2019. We generally hold our cash in interest-bearing money market treasury fund accounts. Our primary
exposure to market risk is interest rate sensitivity, which is affected by changes in the general level of U.S. interest rates. Due to the short-term maturities of
our cash equivalents and the low risk profile of our investments, an immediate 100 basis point change in interest rates would not have a material effect on
the fair market value of our cash equivalents.

Item 8. Financial Statements and Supplementary Data.

The financial statements required to be filed pursuant to this Item 8 are appended to this Annual Report. An index of those financial statements is

found in Item 15.

127

 
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

There has been no change of accountants nor any disagreements with accountants on any matter of accounting principles or practices of financial

disclosure required to be reported under this Item.

Item 9A. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

The Company has established disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) designed
to ensure that information required to be disclosed in the reports that the Company files or submits under the Securities Exchange Act of 1934, as amended,
or Exchange Act, is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and  is accumulated and
communicated to management, including the principal executive officer (our Chief Executive Officer) and principal financial officer (our Chief Financial
Officer), to allow timely decisions regarding required disclosure. In addition, the design of disclosure controls and procedures must reflect the fact that
there are resource constraints and that management is required to apply judgment in evaluating the benefits of possible controls and procedures relative to
their costs.

Our  management,  with  the  participation  of  our  Chief  Executive  Officer  and  Chief  Financial  Officer,  evaluated,  as  of  December  31,  2019,  the
effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act). Management recognizes
that  any  controls  and  procedures,  no  matter  how  well  designed  and  operated,  can  provide  only  reasonable  assurance  of  achieving  the  desired  control
objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Our disclosure
controls and procedures have been designed to provide reasonable assurance of achieving their objectives. Based on that evaluation, our Chief Executive
Officer and Chief Financial Officer concluded that our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange
Act) were effective at the reasonable assurance level as of December 31, 2019

Management’s Annual Report on Internal Control Over Financial Reporting

This Annual Report on Form 10-K does not include a report of management’s assessment regarding our internal control over financial reporting (as
defined  in  Rule  13a-15(f)  under  the  Exchange  Act)  or  an  attestation  report  of  our  independent  registered  accounting  firm  due  to  a  transition  period
established by rules of the SEC for newly public companies.

Changes in Internal Control over Financial Reporting

There was no change in our internal control over financial reporting (as defined in Rule 13a-15(f) of the Exchange Act) that occurred during the
fiscal  quarter  ended  December  31,  2019  that  has  materially  affected,  or  is  reasonably  likely  to  materially  affect,  our  internal  control  over  financial
reporting.

Item 9B. Other Information.

None.

128

Item 10. Directors, Executive Officers and Corporate Governance.

PART III

Except as set forth below, the information required by this item is incorporated by reference from our definitive Proxy Statement to be filed with

the SEC in connection with our 2020 Annual Meeting of Stockholders within 120 days after the end of the fiscal year ended December 31, 2019.

We  have  adopted  a  Code  of  Business  Conduct  and  Ethics  that  applies  to  all  of  our  directors,  officers  and  employees,  including  our  principal
is  posted  on  our  website  at

financial  officer.  The  Code  of  Business  Conduct  and  Ethics 

executive  officer  and  principal 
http://investors.cabalettabio.com/corporate-governance/governance-highlights.

We intend to satisfy the disclosure requirement under Item 5.05 of Form 8-K regarding an amendment to, or waiver from, a provision of this Code
of Business Conduct and Ethics by posting such information on our website, at the address and location specified above and , to the extent required by the
listing standards of The Nasdaq Global Select Market, by filing a Current Report on Form 8-K with the SEC, disclosing such information.

Item 11. Executive Compensation.

The  information  required  by  this  Item  11  will  be  included  in  our  definitive  proxy  statement  to  be  filed  with  the  SEC  with  respect  to  our  2020

Annual Meeting of Stockholders within 120 days after the end of the fiscal year ended December 31, 2019 and is incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

The  information  required  by  this  Item  12  will  be  included  in  our  definitive  proxy  statement  to  be  filed  with  the  SEC  with  respect  to  our  2020

Annual Meeting of Stockholders within 120 days after the end of the fiscal year ended December 31, 2019 and is incorporated herein by reference.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

The  information  required  by  this  Item  13  will  be  included  in  our  definitive  proxy  statement  to  be  filed  with  the  SEC  with  respect  to  our  2020

Annual Meeting of Stockholders within 120 days after the end of the fiscal year ended December 31, 2019 and is incorporated herein by reference.

Item 14. Principal Accounting Fees and Services.

The  information  required  by  this  Item  14  will  be  included  in  our  definitive  proxy  statement  to  be  filed  with  the  SEC  with  respect  to  our  2020

Annual Meeting of Stockholders within 120 days after the end of the fiscal year ended December 31, 2019 and is incorporated herein by reference.

129

Item 15. Exhibits, Financial Statement Schedules.

(a) The following documents are filed as part of this Annual Report on Form 10-K:

(1) Financial Statements:

PART IV

Report of Independent Registered Public Accounting Firm
Balance Sheets as of December 31, 2019 and 2018
Statements of Operations for the Years Ended December 31, 2019 and 2018
Statements of Convertible Preferred Stock and Stockholders’ Equity (Deficit) for the Years Ended December 31, 2019 and 2018
Statements of Cash Flows for the Years Ended December 31, 2019 and 2018
Notes to Financial Statements

(2) Financial Statement Schedules:

Page
F-2
F-3
F-4
F-5
F-6
F-7

All  financial  statement  schedules  have  been  omitted  because  they  are  not  applicable,  not  required  or  the  information  required  is  shown  in  the

financial statements or the notes thereto.

(3) Exhibits. The exhibits required by Item 601 of Regulation S-K and Item 15(b) of this Annual Report on Form 10-K are listed in the Exhibit
Index immediately preceding the signature page of this Annual Report on Form 10-K. The exhibits listed in the Exhibit Index are incorporated by reference
herein.

Item 16. Form 10-K Summary

None.

130

 
 
 
 
 
 
 
 
 
 
 
 
 
INDEX TO FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm
Balance Sheets as of December 31, 2019 and 2018
Statements of Operations for the Years Ended December 31, 2019 and 2018
Statements of Convertible Preferred Stock and Stockholders’ Equity (Deficit) for the Years Ended December 31, 2019 and 2018
Statements of Cash Flows for the Years Ended December 31, 2019 and 2018
Notes to Financial Statements

Page

F-2
F-3
F-4
F-5
F-6
F-7

F-1

 
 
 
 
 
 
 
 
 
 
 
 
Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Cabaletta Bio, Inc.

Opinion on the Financial Statements

We  have  audited  the  accompanying  balance  sheets  of  Cabaletta  Bio,  Inc.  (the  Company)  as  of  December  31,  2019  and  2018,  the  related  statements  of
operations,  convertible  preferred  stock  and  stockholders’  equity  (deficit)  and  cash  flows  for  the  years  then  ended,  and  the  related  notes  (collectively
referred  to  as  the  “financial  statements”).  In  our  opinion,  the  financial  statements  present  fairly,  in  all  material  respects,  the  financial  position  of  the
Company at December 31, 2019 and 2018, and the results of its operations and its cash flows for the years then ended, in conformity with U.S. generally
accepted accounting principles.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial
statements  based  on  our  audits.  We  are  a  public  accounting  firm  registered  with  the  Public  Company  Accounting  Oversight  Board  (United  States)
(PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and
regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor
were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of
internal  control  over  financial  reporting  but  not  for  the  purpose  of  expressing  an  opinion  on  the  effectiveness  of  the  Company’s  internal  control  over
financial reporting. Accordingly, we express no such opinion.

Our  audits  included  performing  procedures  to  assess  the  risks  of  material  misstatement  of  the  financial  statements,  whether  due  to  error  or  fraud,  and
performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in
the  financial  statements.  Our  audits  also  included  evaluating  the  accounting  principles  used  and  significant  estimates  made  by  management,  as  well  as
evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ Ernst & Young LLP

We have served as the Company’s auditor since 2018
Philadelphia, Pennsylvania
March 30, 2020

F-2

 
 
 
CABALETTA BIO, INC.
Balance Sheets
(in thousands, except share and per share amounts)

Assets
Current assets:

Cash and cash equivalents
Prepaid expenses and other current assets

Total current assets
Property, plant and equipment, net
Other assets
Deferred offering costs
Total Assets
Liabilities, convertible preferred stock and stockholders’ equity (deficit)
Current liabilities:

Accounts payable
Accrued and other current liabilities

Total current liabilities

Commitments and contingencies (see Note 7)

Convertible preferred stock:

Series A, A-1 and A-2 convertible preferred stock, $0.00001 par value:
   no shares and 12,393,497 shares authorized as of December 31,
   2019 and 2018, respectively; no and 12,393,047 shares issued and
   outstanding at December 31, 2019 and 2018 respectively; aggregate
   liquidation preference of $38,256 at December 31, 2018

Stockholders’ equity (deficit):
Preferred stock, $0.00001 par value: 10,000,000 and no shares authorized
   as of December 31, 2019 and 2018, respectively; no shares issued
   or outstanding at December 31, 2019 and 2018, respectively
Voting and non-voting common stock, $0.00001 par value: 150,000,000
   (voting 143,590,481 shares and non-voting 6,409,519 shares)
   and 21,147,115 (voting) shares authorized as of December 31, 2019
   and 2018, respectively; 24,034,022 (voting 17,624,503 shares and
   non-voting 6,409,519 shares) and 3,848,320 (voting) shares
   issued and outstanding at December 31, 2019 and 2018, respectively
Additional paid-in capital
Accumulated deficit
Total stockholders’ equity (deficit)
Total liabilities convertible preferred stock and stockholders’ equity (deficit)

December 31,

2019

2018

  $

  $

  $

136,204    $
4,348   
140,552   
815   
101   
—   

141,468    $

920    $

2,227   
3,147   

33,017 
977 
33,994 
— 
— 
180 
34,174 

603 
340 
943 

—   

43,921 

—   

— 

—   
171,280   
(32,959)  
138,321   
141,468    $

— 
1,762 
(12,452)
(10,690)
34,174

  $

The accompanying notes are an integral part of these financial statements.

F-3

 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
    
 
  
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CABALETTA BIO, INC.
Statements of Operations
(in thousands, except share and per share amounts)

Operating expenses:

Research and development
General and administrative

Total operating expenses
Loss from operations
Other income (expense):
Interest income
Fair value adjustments on convertible notes

Net loss
Deemed dividend
Net loss attributable to common stockholders

Net loss per voting and non-voting share, basic and diluted

Year Ended December 31,

2019

2018

  $

  $

  $

11,671    $
7,012   
18,683   
(18,683)  

1,740   
—   
(16,943)  
(5,326)
(22,269)   $

(4.07)   $

4,467 
1,726 
6,193 
(6,193)

235 
(6,244)
(12,202)
— 
(12,202)

(6.87)

The accompanying notes are an integral part of these financial statements.

F-4

 
 
 
 
 
 
 
 
 
 
 
 
    
   
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
Balance—December 31, 2017

Issuance of common stock in
   connection with license
   agreement
Issuance of common stock
Issuance of convertible
   preferred stock upon
   conversion of convertible
   notes
Issuance of convertible
   preferred stock upon
   milestone closing of
   convertible notes
Issuance of convertible
   preferred stock, net of
   issuance costs of $169
Stock-based compensation
Net loss

Balance—December 31, 2018

Issuance of convertible
   preferred stock, net of
   issuance costs of $1,293
Issuance of common stock
   upon completion of initial
   public offering, net of
   issuance costs of $3,408
Issuance of common stock in
   connection with exercise of
   stock options
Exchange of convertible
   preferred stock including
   deemed dividend
Conversion of convertible
   preferred stock into common
   stock on a 1.5 for 1 basis
Stock-based compensation
Net loss

Balance—December 31, 2019

CABALETTA BIO, INC.
Statements of Convertible Preferred Stock and Stockholders’ Equity (Deficit)
(in thousands, except share and per share amounts)

Convertible
Preferred Stock

Preferred Stock

Common Stock

Shares

Amount

Shares

Amount

—  

—  
—  

—  

—  
—  

4,693,044  

15,910  

4,553,452  

15,436  

3,146,551  
—  
—  
12,393,047  

12,575  
—  
—  
43,921  

6,963,788  

48,707  

—  

—  

—  

5,326  

(19,356,835 )  

—  
—  
—  

  $

(97,954 )      
—  
—  
—  

—  

—  
—  

—  

—  

—  
—  
—  
—  

—  

—  

—  

—  

—  
—  
—  
—  

  $

—  

—  
—  

—  

—  

—  
—  
—  
—  

—  

—  

—  

—  

—  
—  
—  
—  

Shares
3,333,332  

Amount

481,318  
33,670  

—  

—  

—  
—  
—  
3,848,320  

—  

7,275,501  

5,667  

—  

12,904,534  
—  
—  
24,034,022  

  $

Additional
Paid-in
Capital

  Accumulated  
Deficit

1  

(250 )  

Total
Stockholders’
  Equity (Deficit)  
(249 )

1,155  
—  

—  

—  

—  
606  
—  
1,762  

—  

71,020  

6  

—  
—  

—  

—  

—  
—  

(12,202 )  
(12,452 )  

—  

—  

—  

1,155  
—  

—  

—  

—  
606  
(12,202 )
(10,690 )

—  

71,020  

6  

(1,762 )  

(3,564 )  

(5,326 )

97,954  
2,300  
—  
171,280  

  $

—  
—  

(16,943 )  
(32,959 )   $

  $

97,954  
2,300  
(16,943 )
138,321  

—  

—  
—  

—  

—  

—  
—  
—  
—  

—  

—  

—  

—  

—  
—  
—  
—  

The accompanying notes are an integral part of these financial statements.

F-5

 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
   
 
 
   
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
   
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
CABALETTA BIO, INC.
Statements of Cash Flows
(in thousands)

Cash flows from operating activities:
Net loss
Adjustments to reconcile net loss to net cash used in operating activities:

Stock-based compensation
Depreciation
Change in fair value of convertible notes
Common stock issued in exchange for research and development

Changes in operating assets and liabilities:

Prepaid expenses and other current assets
Deposits
Accounts payable
Accrued and other current liabilities

Net cash used in operating activities

Cash flows from investing activities:
Purchases of property and equipment

Net cash used in investing activities

Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs
Proceeds from issuance of convertible notes
Proceeds from issuance of convertible preferred stock on milestone
   closing of convertible notes
Proceeds from issuance of convertible preferred stock
Issuance costs of convertible preferred stock
Proceeds from issuance of common stock in connection with
   the exercise of stock options

Net cash provided by financing activities

Net increase in cash and cash equivalents
Cash and cash equivalents—beginning of year
Cash and cash equivalents—end of year

Supplemental disclosures of non-cash investing and
financing activities:

Conversion of convertible notes into convertible preferred stock
Conversion of convertible preferred stock into common stock
Exchange of convertible preferred stock, including deemed dividend
Issuance costs included in accounts payable and accrued and other
   current liabilities
Property and equipment purchases included in accounts payable

Year Ended December 31,

2019

2018

  $

(16,943)   $

(12,202)

2,300   
104   
—   
—   

(3,372)  
(101)  
246   
1,721   
(16,045)  

(693)  
(693)  

71,212   
—   

—   
50,000   
(1,293)  

6   
119,925   
103,187   
33,017   
136,204    $

—    $
97,954    $
10,090    $

192    $
226    $

606 
— 
6,244 
1,155 

(977)

234 
279 
(4,661)

— 
— 

— 
12,535 

12,567 
12,744 
(169)

— 
37,677 
33,016 
1 
33,017 

18,779 
— 
— 

180 
—

  $

  $
  $
  $

  $
  $

The accompanying notes are an integral part of these financial statements.

F-6

 
 
 
 
 
 
 
 
 
 
 
 
 
    
   
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
CABALETTA BIO, INC.

Notes to the Financial Statements
(in thousands, except share and per share amounts)

1. Basis of Presentation

Cabaletta Bio, Inc. (the Company or Cabaletta) was incorporated in April 2017 in the State of Delaware as Tycho Therapeutics, Inc. and, in August
2018, changed its name to Cabaletta Bio, Inc. The Company is headquartered in Pennsylvania. Cabaletta is a clinical-stage biotechnology company focused
on the discovery and development of engineered T cell therapies for B cell-mediated autoimmune diseases.

Principal  operations  commenced  in  April  2018,  when  the  Company  executed  two  sponsored  research  agreements  with  the  Trustees  of  the

University of Pennsylvania (Penn).

On October 16, 2019, the Company effected a 1-for-1.5 reverse split of the Company’s issued and outstanding shares of common stock, par value
$0.00001 per share (Common Stock). Upon the effectiveness of the reverse stock split: (i) all shares of outstanding Common Stock were adjusted; (ii) the
conversion price of the Series A convertible preferred stock (Series A Preferred), Series A-1 convertible preferred stock (Series A-1 Preferred), Series A-2
convertible  preferred  stock  (Series  A-2  Preferred)  and  Series  B  convertible  preferred  stock  (Series  B  Preferred;  collectively,  the  Preferred  Shares)  was
adjusted; (iii) the number of shares of Common Stock for which each outstanding option to purchase Common Stock is exercisable was adjusted; and (iv)
the exercise price of each outstanding option to purchase Common Stock was adjusted. All of the outstanding Common Stock share numbers (including
shares of Common Stock subject to the Company’s options and as converted for the outstanding convertible preferred stock shares), share prices, exercise
prices and per share amounts contained in the financial statements have been retroactively adjusted in the financial statements to reflect this reverse stock
split for all periods presented. The par value per share and the authorized number of shares of Common Stock and convertible preferred stock were not
adjusted as a result of the reverse stock split.

On  October  29,  2019,  the  Company  completed  its  initial  public  offering  (IPO)  of  6,800,000  shares  of  Common  Stock  at  an  offering  price  of
$11.00 per share. The Company received net proceeds of $66,156 after deducting underwriting discounts, commissions and estimated offering expenses. In
connection  with  the  IPO,  the  Company’s  outstanding  shares  of  convertible  preferred  stock  were  automatically  converted  into  12,904,534  shares  of
Common  Stock.  In  November  2019,  the  underwriters  partially  exercised  their  option  and  purchased  an  additional  475,501  shares  of  Common  Stock
resulting in net proceeds to the Company of $4,864, after deducting underwriting discounts and commissions.

Risks and Uncertainties

The Company does not expect to generate revenue from sales of engineered T cell therapies for B cell-mediated autoimmune diseases or any other
revenue unless and until the Company completes preclinical and clinical development and obtains regulatory approval for one or more product candidates.
If  the  Company  seeks  to  obtain  regulatory  approval  for  any  of  its  product  candidates,  the  Company  expects  to  incur  significant  commercialization
expenses.

The Company has sustained annual operating losses and expects to continue to generate operating losses for the foreseeable future. The Company’s
ultimate  success  depends  on  the  outcome  of  its  research  and  development  activities.  The  Company  had  cash  and  cash  equivalents  of  $136,204  as  of
December 31, 2019. Through December 31, 2019, the Company has incurred an accumulated deficit of $32,959. Management expects to incur additional
losses in the future as it continues its research and development and will need to raise additional capital to fully implement its business plan and to fund its
operations.

The  Company  intends  to  raise  such  additional  capital  through  a  combination  of  equity  offerings,  debt  financings,  government  funding
arrangements, strategic alliances or other sources. However, if such financing is not available at adequate levels and on a timely basis, or such agreements
are not available on favorable terms, or at all, as and when needed, the Company will need to reevaluate its operating plan and may be required to delay or
discontinue the development of one or more of its product candidates or operational initiatives. The Company expects that its cash and cash equivalents as
of December 31, 2019, will be sufficient to fund its projected operations for at least 12 months following the date of these financial statements.

F-7

 
 
The Company is subject to risks common to companies in the biotechnology industry including, but not limited to, new technological innovations,
protection of proprietary technology, dependence on key personnel, compliance with government regulations and the need to obtain additional financing.
As a result, the Company is unable to predict the timing or amount of increased expenses or when or if the Company will be able to achieve or maintain
profitability. Further, the Company is currently dependent on Penn for much of its preclinical research, clinical research and development activities and
expects to be dependent upon Penn for initial manufacturing activities (Note 7). Product candidates currently under development will require significant
additional research and development efforts, including extensive preclinical and clinical testing and regulatory approval, prior to commercialization. Even
if the Company is able to generate revenues from the sale of its product candidates, if approved, it may not become profitable. If the Company fails to
become profitable or is unable to sustain profitability on a continuing basis, then it may be unable to continue its operations at planned levels and be forced
to reduce its operations.

2. Summary of Significant Accounting Policies

Use of Estimates

The  preparation  of  financial  statements  in  conformity  with  accounting  principles  generally  accepted  in  the  United  States  of  America  (GAAP)
requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and
liabilities as of the date of the financial statements and the reported amounts of expenses during the reporting period. Significant estimates and assumptions
made  in  the  accompanying  financial  statements  include  but  are  not  limited  to  the  fair  value  of  common  stock,  stock-based  compensation,  the  valuation
allowance  on  the  Company’s  deferred  tax  assets,  and  the  fair  value  of  convertible  debt.  The  Company  evaluates  its  estimates  and  assumptions  on  an
ongoing  basis  using  historical  experience  and  other  factors  and  adjusts  those  estimates  and  assumptions  when  facts  and  circumstances  dictate.  Actual
results could differ from those estimates.

Off-Balance Sheet Risk and Concentrations of Credit Risk

Financial  instruments,  which  potentially  subject  the  Company  to  significant  concentration  of  credit  risk,  consist  primarily  of  cash  and  cash
equivalents, which are maintained at a federally insured financial institution. The deposits held at this institution are in excess of federally insured limits.
The Company has not experienced any losses in such accounts and management believes that the Company is not exposed to significant credit risk due to
the financial position of the depository institution in which those deposits are held. The Company has no off‑balance sheet risk, such as foreign exchange
contracts, option contracts, or other foreign hedging arrangements.

Cash and Cash Equivalents

The Company considers all highly liquid investments purchased with original maturities of three months or less from the purchase date to be cash

equivalents. Cash equivalents consist primarily of amounts invested in money market accounts.

Deferred Offering Costs

The  Company  capitalizes  certain  legal,  professional  accounting  and  other  third-party  fees  that  are  directly  associated  with  in-process  equity
financings  as  deferred  offering  costs  until  such  financings  are  consummated.  After  consummation  of  the  equity  financing,  these  costs  are  recorded  in
stockholders’ deficit as a reduction of additional paid-in capital generated as a result of the offering. Should the in-process equity financing be abandoned,
the deferred offering costs will be expensed immediately as a charge to operating expenses in the statements of operations. Offering costs, including legal,
accounting,  and  filing  fees  related  to  the  IPO,  were  deferred  and  were  offset  against  the  offering  proceeds  upon  the  completion  of  the  IPO.  Upon
completion  of  the  IPO,  $3,408  of  such  deferred  offering  costs  were  reclassified  to  additional  paid  in  capital.  There  were  no  deferred  offering  costs
capitalized as of December 31, 2019.

F-8

 
 
Property, Plant and Equipment

Property,  plant  and  equipment  are  recorded  at  cost  less  accumulated  depreciation.  Cost  includes  the  acquisition  costs  and  all  costs  necessary  to
bring the asset to the location and working condition necessary for its intended use. Depreciation expense is recognized using the straight-line method over
the estimated useful life of each asset. Upon retirement or sale, the cost of assets disposed of and the related accumulated depreciation are removed from
the accounts and any resulting gain or loss is included in the accompanying statements of operations. Expenditures for normal, recurring or periodic repairs
and maintenance related to property and equipment are charged to expense as incurred. The cost for planned major maintenance activities, including the
related acquisition or construction of assets, is capitalized if it will result in future economic benefits.

Estimated useful lives for property and equipment are as follows:

Property and equipment
Laboratory equipment
Furniture and fixtures
Computer equipment
Leasehold improvements

Fair Value Measurement

Estimated useful life

Three years
Three years
Three years
Lesser of estimated useful life or remaining lease term

Assets and liabilities recorded at fair value on a recurring basis in the balance sheets are categorized based upon the level of judgment associated
with the inputs used to measure their fair values. Fair value is defined as the exchange price that would be received for an asset or an exit price that would
be paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on
the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable
inputs.  The  authoritative  guidance  on  fair  value  measurements  establishes  a  three-tier  fair  value  hierarchy  for  disclosure  of  fair  value  measurements  as
follows:

Level 1—Observable inputs such as unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Level  2—Inputs  (other  than  quoted  prices  included  in  Level  1)  that  are  either  directly  or  indirectly  observable  for  the  asset  or  liability.  These
include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that
are not active.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Accrued Research and Development Costs

The Company records accrued liabilities for estimated costs of research and development activities conducted by service providers, which include
activities under the Penn Agreement (Note 7), the conduct of sponsored research, preclinical studies and contract manufacturing activities. The Company
records  the  estimated  costs  of  research  and  development  activities  based  upon  the  estimated  amount  of  services  provided  and  includes  these  costs  in
accrued and other current liabilities and prepaid expenses and other current assets in the accompanying balance sheets and within research and development
expense in the accompanying statements of operations.

The Company accrues for these costs based on factors such as estimates of the work completed and in accordance with agreements established with
service providers. The Company makes significant judgments and estimates in determining the accrued liabilities and prepaid expenses in each reporting
period. As actual costs become known, the Company adjusts its accrued liabilities and prepaid expenses. The Company has not experienced any material
differences between accrued costs and actual costs incurred since its inception.

F-9

 
 
 
 
 
 
 
 
 
 
 
Research and Development Expenses

Research and development costs include costs incurred for internal and external research and development activities and are expensed as incurred
in  the  accompanying  statements  of  operations.  Research  and  development  costs  consist  of  salaries  and  benefits,  including  associated  stock-based
compensation, and laboratory supplies and facility costs, as well as fees paid to entities that conduct certain research and development activities on the
Company’s behalf.

Stock-based Compensation

The  Company  measures  its  stock-based  awards  granted  to  employees  and  non-employees  based  on  the  estimated  fair  values  of  the  awards  and
recognizes the compensation over the requisite service period. The Company uses the Black-Scholes option-pricing model (Black-Scholes) to estimate the
fair  value  of  its  stock-based  awards.  The  Company  uses  the  simplified  method  in  accordance  with  guidance  provided  by  the  Securities  and  Exchange
Commission  and  calculates  the  expected  term  as  the  midpoint  between  the  vesting  date  and  the  contractual  term  for  certain  awards  with  service  or
performance  conditions.  Stock-based  compensation  is  recognized  using  the  straight-line  method.  As  stock-based  compensation  is  based  on  awards
ultimately expected to vest, it is reduced by forfeitures. The Company accounts for forfeitures as they occur.

Income Taxes

The Company uses the asset and liability method of accounting for income taxes. Deferred tax assets and liabilities are recognized for the estimated
future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their
respective tax base. Deferred tax assets and liabilities, which relate primarily to the carrying amount of the Company’s property and equipment and its net
operating loss carryforwards, are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences
are  expected  to  be  recovered  or  settled.  Deferred  tax  expense  or  benefit  is  the  result  of  changes  in  the  deferred  tax  assets  and  liabilities.  Valuation
allowances are established when necessary to reduce deferred tax assets where, based upon the available evidence, the Company concludes that it is more-
likely-than-not that the deferred tax assets will not be realized. In evaluating its ability to recover deferred tax assets, the Company considers all available
positive and negative evidence, including its operating results, ongoing tax planning and forecasts of future taxable income on a jurisdiction-by-jurisdiction
basis.  Because  of  the  uncertainty  of  the  realization  of  deferred  tax  assets,  the  Company  has  recorded  a  full  valuation  allowance  against  its  deferred  tax
assets.

Reserves are provided for tax benefits for which realization is uncertain. Such benefits are only recognized when the underlying tax position is
considered  more-likely-than-not  to  be  sustained  on  examination  by  a  taxing  authority,  assuming  they  possess  full  knowledge  of  the  position  and  facts.
Interest and penalties related to uncertain tax positions are recognized in the provision of income taxes; however, the Company currently has no interest or
penalties related to uncertain income tax benefits.

Comprehensive Loss

The Company did not have any items of comprehensive income or loss other than net loss for the years ended December 31, 2019 and 2018.

Net Loss Per Share

The Company calculates basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required
for participating securities. The Company has voting and non-voting common stock. The rights, including the liquidation and dividend rights, of the holders
of the voting and non-voting common stock are identical, except with respect to voting. Each share of non-voting common stock may be converted at any
time into one share of voting common stock at the option of its holder by providing written notice to the Company, subject to the limitations provided for in
the amended and restated certificate of incorporation. The Company also considers its unvested shares of common stock held by the Company’s founders
and, prior to its

F-10

 
 
conversion to common stock, its convertible preferred stock to be participating securities as, in the event a dividend is paid on common stock, the holders
of  convertible  preferred  stock  and  unvested  shares  of  common  stock  would  be  entitled  to  receive  dividends  on  a  basis  consistent  with  the  common
stockholders. The net loss attributable to common stockholders is not allocated to the convertible preferred stock nor to the unvested shares of common
stock as the holders of those securities do not have a contractual obligation to share in losses.

Basic  net  loss  per  share  attributable  to  common  stockholders  is  computed  by  dividing  the  net  loss  attributable  to  common  stockholders  by  the
weighted average number of shares of common stock, which excludes unvested shares of common stock. The undistributed loss for each year is allocated
to common stockholders based on the contractual participation rights of the voting and non-voting common stock as if the losses for the year had been
distributed.  As  the  liquidation  and  dividend  rights  are  identical,  the  undistributed  losses  are  allocated  on  a  proportionate  basis.  Net  loss  attributable  to
common stockholders is calculated by adjusting the net loss of the Company for the deemed dividend associated with the exchange of Series A-2 Preferred
for Series B Preferred. Diluted net loss per share attributable to common stockholders is computed under the if-converted method and assumes that all non-
voting common stock has been converted to common stock. Since the Company was in a loss position for all periods presented, the effects of the other
potentially dilutive securities are antidilutive.

Segments

Operating segments are defined as components of an entity for which separate financial information is available and that is regularly reviewed by
the  Chief  Operating  Decision  Maker  (CODM)  in  deciding  how  to  allocate  resources  to  an  individual  segment  and  in  assessing  performance.  The
Company’s CODM is its Chief Executive Officer. The Company has determined it operates in a single operating segment and has one reportable segment.

Related Party Transactions

The  Company  engaged  a  firm  controlled  by  a  former  executive  (until  February  2019)  of  the  Company  for  professional  services  related  to
accounting, finance and other administrative functions. For the years ended December 31, 2019 and 2018, the costs incurred under this arrangement totaled
$601  and  $186,  respectively.  These  amounts  were  recorded  as  general  and  administrative  expense  in  the  accompanying  statements  of  operations.  As  of
December 31, 2019 and 2018, amounts owed under this arrangement totaled $36 and $50, respectively, and are included in accounts payable and other
current liabilities in the accompanying balance sheets, respectively.

The Company engaged the services of its current Chief Executive Officer and President prior to his employment in October 2018. For the year
ended  December  31,  2018,  the  costs  incurred  under  this  arrangement  totaled  $180,  which  was  recorded  as  general  and  administrative  expense  in  the
accompanying statements of operations.

Emerging Growth Company Status

The  Company  is  an  emerging  growth  company,  as  defined  in  the  Jumpstart  Our  Business  Startups  Act  of  2012  (the  JOBS  Act).  Under  the
JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act, until
such time as those standards apply to private companies. The Company has elected to use this extended transition period for complying with new or revised
accounting standards that have different effective dates for public and private companies until the earlier of the date that it (i) is no longer an emerging
growth  company  or  (ii)  affirmatively  and  irrevocably  opts  out  of  the  extended  transition  period  provided  in  the  JOBS Act.  As  a  result,  these  financial
statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates.

Recently Issued Accounting Pronouncements

In  February  2016,  the  Financial  Accounting  Standards  Board  (FASB)  issued  ASU  2016-02,  Leases  (Topic  842),  with  guidance  regarding  the
accounting for and disclosure of leases. The update requires lessees to recognize the liabilities related all leases, including operating leases, with a term
greater than 12 months on the balance sheet.

F-11

 
 
This  update  also  requires  lessees  and  lessors  to  disclose  key  information  about  their  leasing  transactions.  This  guidance  will  be  effective  for  public
companies for annual and interim periods beginning after December 15, 2018. For all other entities, this standard is effective for annual reporting periods
beginning  after  December  15,  2020,  and  interim  periods  within  annual  periods  beginning  after  December  15,  2021.  Early  adoption  is  permitted.  The
Company expects to adopt Topic 842 for its annual period ending December 31, 2021 but has yet to evaluate the effect that ASU 2016-02 will have on its
financial statements or financial statement disclosures.

3. Fair Value Measurements

As of December 31, 2019 and 2018, the Company had money market funds, which were valued by the Company based on quoted market prices,

which represent a Level 1 measurement within the fair value hierarchy.

The following tables present information about the Company’s financial assets measured at fair value on a recurring basis and indicate the level of

the fair value hierarchy utilized to determine such fair values:

Financial assets
Cash equivalents:

Money market funds

Total

Financial assets
Cash equivalents:

Money market funds

Total

Total

Quoted Prices in Active
Markets for Identical
Assets (Level 1)

Significant Other
Observable Inputs
(Level 2)

Significant
Unobservable Inputs
(Level 3)

December 31, 2019

  $
  $

136,204    $
136,204    $

136,204    $
136,204    $

— 
 $
—    $

— 
—

Total

Quoted Prices in Active
Markets for Identical
Assets (Level 1)

Significant Other
Observable Inputs
(Level 2)

Significant
Unobservable Inputs
(Level 3)

December 31, 2018

  $
  $

33,017    $
33,017    $

33,017    $
33,017    $

— 
 $
—    $

— 
—

The  following  table  presents  a  roll-forward  of  the  aggregate  fair  values  of  the  Company’s  convertible  notes  (Note  6)  for  which  fair  value  is

determined by Level 3 inputs:

Balance—January 1, 2018
Initial fair value
Fair value adjustments
Conversion into convertible preferred stock
Balance—December 31, 2018

  $

  $

— 
12,535 
6,244 
(18,779)
—

There were no transfers among Level categories in the periods presented.

The carrying value of cash, cash equivalents, accounts payable and accrued expenses that are reported on the balance sheets approximate their fair

value due to the short-term nature of these assets and liabilities.

F-12

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
    
 
    
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
    
 
    
 
  
  
  
 
 
 
 
 
 
 
 
 
 
 
4. Property, Plant and Equipment

Property plant and equipment consists of the following:

Laboratory equipment
Furniture and fixtures
Leasehold improvements
Computer equipment

Total property, plant and equipment

Less: accumulated depreciation

Property, plant and equipment, net

Depreciation expense was $104 and $0 for the years ended December 31, 2019 and 2018, respectively.

5. Accrued and Other Current Liabilities

Accrued and other current liabilities consist of the following:

Research and development services
General and administrative services
Compensation expense
Other

6. Convertible Notes

December 31,

2019

2018

544    $
277   
57   
41   
919   
(104)  
815    $

December 31,

2019

2018

231    $
297   
1,522   
177   
2,227    $

— 
— 
— 
— 
— 
— 
—

181 
36 
121 
2 
340

  $

  $

  $

  $

In May 2018, the Company issued convertible notes (the Notes) with aggregate proceeds to the Company in an initial closing of $12,535, including
$5,000 issued to Penn. The Notes carried a stated interest rate of 7.5% per annum. All unpaid principal, together with the then accrued interest, for the
Notes was due and payable at the earlier of May 4, 2021 or upon an event of default. The terms of the Notes provided for an additional milestone-based
closing  of  $12,567  upon  the  achievement  of  certain  Company-specific  events.  The  Notes  contained  a  number  of  provisions  addressing  automatic  and
optional conversion, events of default and prepayment provisions.

The Notes were amended in September 2018 to adjust the terms of the automatic and optional conversion provisions. In October 2018, the Notes
were amended again to reduce the qualified financing threshold, make a qualified financing a milestone event, revise the structure of a milestone-based
closing  and  reallocate  milestone  closing  purchase  rights  to  new  purchasers  and  the  existing  noteholders.  On  the  same  day,  immediately  following  the
amendment of the Notes, the Company completed a qualified financing, issuing 3,146,551 shares of Series A Preferred for gross proceeds of $12,744 (Note
8).  At  this  time,  the  Company  issued  4,553,452  shares  of  Series  A-1  Preferred  in  connection  with  the  milestone-based  closing  resulting  in  $12,567  of
proceeds ($2.76 per share) and the Notes together with interest accrued thereon ($409) were converted into 2,819,267 shares of Series A-1 Preferred and
1,873,777 shares of Series A-2 Preferred, reflecting a conversion price per share of $2.76.

On issuance, the Company elected to account for the Notes at fair value with any changes in fair value being recognized through the statements of
operations until the Notes settled. In this connection, the Company’s policy is to report a single non-operating income/(expense) line item to record fair
value adjustments on convertible notes and does not report interest expense as a separate line item in the statements of operations. On issuance, total debt
issuance costs of $53 were expensed and recognized as general and administrative expense in the accompanying statements of operations.

On issuance, the fair value of the Notes was determined to be equal to $12,535, which is the principal amount of the Notes. The fair value of the

Notes upon settlement was determined based on the fair value of the Series A-1

F-13

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Preferred and Series A-2 Preferred issued, which was determined to be $3.39 per share of Series A-1 Preferred and Series A-2 Preferred, using an option
pricing  method  (OPM)  framework  and  utilized  the  back-solve  method  for  inferring  and  allocating  the  equity  value  predicated  on  the  capital  raise  that
transpired  just  prior  to  the  valuation  date.  This  method  was  selected  as  the  Company  concluded  that  the  contemporaneous  financing  transaction  was
an arm’s-length transaction. Application of the OPM back-solve method involves making assumptions for the expected time to liquidity, volatility and risk-
free rate and then solving for the value of equity such that value for the most recent financing equals the amount paid. The OPM allocation of total equity
value was determined with reference to a recent financing transaction and the Company assumed a 71% volatility rate, a 1.3-year estimated term and a
probability weighted average discount for lack of marketability of 35%.

For the year ended December 31, 2018, the Company recognized $6,244 in in the accompanying statements of operations as other expense—fair
value  adjustments  on  the  Notes,  which  reflects  (i)  the  difference  between  the  conversion  price  per  share  of  the  Series  A-1  Preferred  and  Series  A-2
Preferred ($2.76) into which the Notes were converted, and the fair value of such Series A-1 Preferred and Series A-2 Preferred, (ii) the difference between
the price per share paid for the Series A-1 Preferred ($2.76) in the milestone-based closing and the fair market value of such Series A-1 Preferred and (iii)
interest accrued on the Notes ($409). All outstanding Notes were converted to 2,819,267 shares of Series A-1 Preferred and 1,873,777 shares of Series A-2
Preferred in October 2018 and no Notes were outstanding as of December 31, 2019 and 2018.

7. Commitments and Contingencies

Operating Lease Agreement

In  February  2019,  the  Company  entered  into  an  operating  lease  agreement  for  new  office  space  in  Philadelphia,  Pennsylvania.  The  lease  term
commenced  in  May  2019  and  will  expire  in  July  2022.  The  initial  annual  base  rent  is  $261,  and  such  amount  will  increase  by  2%  annually  on  each
anniversary of the commencement date. The Company records rent expense on a straight-line basis over the lease term. Rent expense related to this lease
agreement recognized in the accompanying statement of operations was $178 for the year ended December 31, 2019.

As of December 31, 2019, the future minimum payments for operating leases are as follows:

2020
2021
2022
Thereafter

$

$

263 
268 
158 
— 
689

License Agreement with the Trustees of the University of Pennsylvania

In August 2018, the Company entered into a license agreement with Penn (the Penn Agreement) and activated the license in October 2018 pursuant
to which the Company obtained (a) a non-exclusive, non-sublicensable worldwide license to certain of Penn’s intellectual property to conduct research,
product development, clinical trials, cell manufacturing and other activities, and (b) an exclusive, worldwide, royalty-bearing right and license, with a right
to sublicense, on a target-by-target basis, under certain of Penn’s intellectual property to make, use, sell, offer for sale, import, and otherwise commercialize
products for the treatment of autoimmune and alloimmune diseases. In July 2019, the Penn Agreement was amended and restated to include CHOP as a
party to the agreement.

Unless  earlier  terminated,  the  Penn  Agreement  expires  on  the  expiration  or  abandonment  or  other  termination  of  the  last  valid  claim  in  Penn’s
intellectual property licensed by the Company. The Company may terminate the Penn Agreement at any time for convenience upon 60 days written notice.
In the event of an uncured, material breach, Penn may terminate the Penn Agreement upon 60 days written notice.

Under the terms of the Penn Agreement, the Company issued 481,318 shares of common stock, with a value of $1,155, recorded as a research and

development expense in the accompanying statements of operations for the year ended December 31, 2018.

F-14

 
 
 
 
 
 
 
 
 
 
 
The  Company  also  reimbursed  Penn  for  its  prior  out-of-pocket  expenses  with  respect  to  the  filing,  prosecution  and  maintenance  of  Penn’s
intellectual  property  licensed  by  the  Company.  The  payment,  totaling  $89,  is  included  in  general  and  administrative  expense  in  the  accompanying
statements of operations for the year ended December 31, 2018. Under the terms of the Penn Agreement, the Company is obligated to pay $2,000 annually
for  three  years  beginning  August  2018  for  funding  to  the  laboratories  of  each  of  Drs.  Milone  and  Payne  (see  Sponsored  Research  Agreements—Penn).
During the term of the Penn Agreement until the first commercial sale of the first product, the Company is obligated to pay Penn a non-refundable, non-
creditable annual license maintenance fee of $10. The Company is required to pay certain milestone payments upon the achievement of specified clinical
and commercial milestones. Milestone payments are reduced by a certain percentage for the second product that achieves a milestone, by an additional
percentage for the third product that achieves a milestone, and so on, for each subsequent product that achieves a milestone. In the event that the Company
is able to successfully develop and launch multiple products under the Penn Agreement, total milestone payments could approach $20,000. Penn is also
eligible to receive tiered royalties at percentage rates in the low single-digits, subject to an annual minimum royalty, on annual worldwide net sales of any
products that are commercialized by the Company or its sublicensees that contain or incorporate, or are covered by, the intellectual property licensed by the
Company. To the extent the Company sublicenses its license rights under the Penn Agreement, Penn would be eligible to receive tiered sublicense income
at percentage rates in the mid-single to low double-digits.

No amounts were due under the Penn Agreement as of December 31, 2019.

Sponsored Research Agreements

Penn

The  Company  has  sponsored  research  agreements  with  two  faculty  members  at  Penn,  who  are  also  scientific  co-founders  of  the  Company  and
members of the Company’s scientific advisory board. Under the agreements, the Company has committed to funding a defined research plan for three years
through  April  2021.  The  total  estimated  three-year  cost  of  $8,524  under  the  two  agreements  satisfies  the  Company’s  annual  obligation  under  the  Penn
Agreement  (see  License  Agreement  with  the  University  of  Pennsylvania  above).  For  the  years  ended  December  31,  2019  and  2018,  the  Company
recognized  research  and  development  expense  of  $2,137  and  $1,957,  respectively,  related  to  these  agreements  in  the  accompanying  statements  of
operations. As of December 31, 2019 and 2018, $1,588 and $884, respectively, of advance payments are included in prepaid expenses and other current
assets in the accompanying balance sheets.

F-15

 
 
Master Translational Research Services Agreement

In  October  2018,  the  Company  entered  into  a  services  agreement  (the  Services  Agreement)  with  Penn  for  additional  research  and  development
services  from  various  laboratories  within  Penn.  The  research  and  development  activities  are  detailed  in  separately  executed  Penn  organization-specific
addenda.

Research and development expense related to executed addenda under the master translational research service agreement with Penn recognized
in the accompanying statements of operations for the year ended December 31, 2019 was $2,355. Amounts due under the master translational research
service  agreement  with  Penn  were  $94  as  of  December  31,  2019  and  is  included  in  accrued  liabilities.  The  Company  may  incur  expenses  up  to  $900
through the remaining term of the Addendum in 2020 related to the manufacture of vector under the Center for Advanced Retinal and Ocular Therapeutics,
or CAROT, Addendum.

Subscription and Technology Transfer Agreement

In July 2019, the Company entered into a subscription and technology transfer agreement pursuant to which the Company owed Penn an upfront
subscription fee, which was paid in 2019, and a nominal non-refundable royalty on the net sales of products, a portion of which will be credited toward
milestone payments and royalties, respectively, under the Amended License Agreement. Technology transfer activities will be at the Company’s cost and
subject to agreement as to the technology to be transferred. Under this agreement, the Company recognized $250 of research and development expense for
the year ended December 31, 2019.

Manufacturing Agreements

Under  agreement  with  a  manufacturer,  the  Company  is  progressing  a  staged  plan  for  vector  development  and  may  incur  up  to  $1,300  in

committed spend.

Other Purchase Commitments

In  the  normal  course  of  business,  the  Company  enters  into  various  purchase  commitments  with  third-party  contract  manufacturers  for  the
manufacture  and  processing  of  its  product  candidates  and  related  raw  materials,  contracts  with  contract  research  organizations  for  clinical  trials  and
agreements with vendors for other services and products for operating purposes. These agreements generally provide for termination or cancellation, other
than for costs already incurred.  

Indemnification

The Company enters into certain types of contracts that contingently requires the Company to indemnify various parties against claims from third
parties. These contracts primarily relate to (i) the Company’s bylaws, under which the Company must indemnify directors and executive officers, and may
indemnify other officers and employees, for liabilities arising out of their relationship, (ii) contracts under which the Company must indemnify directors
and certain officers and consultants for liabilities arising out of their relationship, (iii) contracts under which the Company may be required to indemnify
partners  against  certain  claims,  including  claims  from  third  parties  asserting,  among  other  things,  infringement  of  their  intellectual  property  rights,  and
(iv) procurement, consulting, or license agreements under which the Company may be required to indemnify vendors, consultants or licensors for certain
claims, including claims that may be brought against them arising from the Company’s acts or omissions with respect to the supplied products, technology
or services. From time to time, the Company may receive indemnification claims under these contracts in the normal course of business. In addition, under
these contracts, the Company may have to modify the accused infringing intellectual property and/or refund amounts received.

In  the  event  that  one  or  more  of  these  matters  were  to  result  in  a  claim  against  the  Company,  an  adverse  outcome,  including  a  judgment  or
settlement, may cause a material adverse effect on the Company’s future business, operating results or financial condition. It is not possible to determine
the  maximum  potential  amount  under  these  contracts  due  to  the  limited  history  of  prior  indemnification  claims  and  the  unique  facts  and  circumstances
involved in each particular agreement.

F-16

 
 
8. Convertible Preferred Stock

Preferred Stock

The Company has 10,000,000 shares of authorized preferred stock as of December 31, 2019, none of which is issued or outstanding. The preferred

stock is not redeemable and does not have a stated voting, dividend or liquidation preference.

Convertible Preferred Stock

The  Company  has  issued  Series  A  Preferred,  Series  A-1  Preferred,  Series  A-2  Preferred,  and  Series  B  Preferred  (collectively,  the  Convertible
Preferred  Stock).  The  Company  classifies  Convertible  Preferred  Stock  outside  of  stockholders’  equity  (deficit)  because  the  shares  contain  deemed
liquidation rights that are a contingent redemption feature not solely within the control of the Company. The following table summarizes the Company’s
Convertible Preferred Stock:

Series A Preferred

Series A-1 Preferred

Series A-2 Preferred

Series B Preferred

Total Convertible
Preferred Stock

Shares

Amount

Shares

Amount

Shares

Amount

Shares

Amount

Shares

Amount

—  

  $

—  

—  

  $

—  

—  

  $

2,819,267  

9,558  

1,873,777  

6,352  

—  

  $

—  

4,693,044  

15,910  

Balance—December 31, 2017

Issuance on conversion
   of convertible notes
Issuance on milestone
   closing of convertible
   notes
Issuance
Issuance costs

Balance—December 31, 2018

Issuance
Exchange, including
   deemed dividend
Issuance costs
Conversion to common
   stock

Balance—December 31, 2019

—  

  $

—  

—  
3,146,551  
—  
3,146,551  
—  

—  
—  

—  

—  

—  
12,744  
(169 )
12,575  
—  

—  
—  

4,553,452  
—  
—  
7,372,719  
—  

—  
—  

15,436  
—  
—  
24,994  
—  

—  
—  
—  
1,873,777  
—  

—  
—  

(1,405,332 )  

—  

—  
—  
—  
6,352  
—  

(4,764 )
—  

(1,588 )
—  

—  

—  
—  

—  
6,963,788  

1,405,332  
—  

—  

—  

—  
—  

—  
50,000  

10,090  
(1,293 )  

4,553,452  
3,146,551  
—  
12,393,047  
6,963,788  

—  
—  

15,436  
12,744  
(169 )
43,921  
50,000  

5,326  
(1,293 )

(97,954 )
—  

(3,146,551 )
—  

  $

(12,575 )
—  

(7,372,719 )
—  

  $

(24,994 )  

(468,445 )  

—  

—  

  $

(8,369,120 )
—  

  $

(58,797 )  

(19,356,835 )  

—  

—  

  $

In October 2018, the Company issued 3,146,551 shares of Series A Preferred, resulting in gross proceeds of $12,744. Series A-1 Preferred and

Series A-2 Preferred were issued October 2018 upon conversion of the Notes and in connection with the milestone closing of the Notes (Note 6).

In  January  2019,  the  Company’s  certificate  of  incorporation  was  amended  to  increase  the  authorized  shares  of  Convertible  Preferred  Stock  to
20,762,168 shares, and the Company issued 6,963,788 shares of Series B Preferred, resulting in gross proceeds of $50,000. In connection, the Company
issued a further 1,405,332 shares of Series B Preferred in exchange for 1,405,332 shares of Series A-2 Preferred. The Company determined the terms of the
Series B Preferred to be materially, qualitatively different than the terms of the Series A-2 Preferred and, as such, applied extinguishment accounting with
respect to the Series A-2 Preferred received in the exchange resulting in removal of the carrying amount of the Series A-2 Preferred received ($4,764), the
addition of the Series B Preferred issued at fair value determined with reference to the contemporaneous issuance of Series B Preferred ($10,090) and the
difference  ($5,326)  determined  to  be  a  deemed  dividend  recorded  to  additional  paid-in  capital  (to  the  extent  of  paid-in  capital)  and  accumulated  deficit
within stockholders’ deficit on the balance sheet.

The holders of the Convertible Preferred Stock had various rights, preferences and privileges as follows:

Voting Rights

Series A-2 Preferred are non-voting shares. Each share of Series A Preferred, Series A-1 Preferred and Series B Preferred (the Voting Preferred
Stock) shall be entitled to cast the number of votes equal to the number of whole shares of common stock into which such shares of Voting Preferred Stock
are convertible as of the record date for determining stockholders entitled to vote on such matter holds a number of votes equal to the number of shares of
common stock into which it is convertible. Generally, holders of Voting Preferred Stock shall vote together with the holders of common stock as a single
class and on an as-converted into common stock basis.

F-17

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
   
 
 
 
 
Holders of shares of Series A Preferred and Series A-1 Preferred, exclusively and as a separate class, are entitled to elect three members of the
board  of  directors.  Holders  of  shares  of  common  stock  are  entitled  to  elect  one  member  of  the  board  of  directors.  The  holders  of  common  stock  and
Convertible  Preferred  Stock,  voting  together  as  a  single  class  on  an  as-converted  basis,  are  entitled  to  elect  the  balance  (two)  of  the  total  number  of
directors of the Company.

Dividends

The holders of shares of Convertible Preferred Stock shall be entitled to receive, on a pari passu basis, dividends, out of any assets legally available
therefor,  prior  and  in  preference  to  any  declaration  or  payment  of  any  dividend  (other  than  dividends  on  shares  of  common  stock  payable  in  shares  of
common stock) on the common stock, at a rate of (i) $0.24 per annum for each share of Series A Preferred, (ii) $0.1656 per annum for each share of Series
A-1 Preferred, (iii) $0.1656 per annum for each share of Series A-2 Convertible Preferred Stock and (iv) $0.4308 per annum for each share of Series B
Preferred, in each case, as adjusted for any stock splits, stock dividends, combinations, subdivisions, or other similar recapitalization affecting such shares.
Dividends are payable when, as and if declared by the board of directors, and such dividends shall not be cumulative.

The  holders  of  each  series  of  Convertible  Preferred  Stock  can  waive  any  dividend  preference  that  the  holders  of  such  series  of  Convertible
Preferred Stock shall be entitled to receive upon the affirmative vote or written consent of the holders of at least a majority of the shares of such series of
Convertible Preferred Stock then outstanding, voting together as a separate series, and on an as-converted to common stock basis.

After payment of such dividends on the shares of Convertible Preferred Stock, any additional dividends or distributions shall be distributed among
all holders of common stock and Convertible Preferred Stock in proportion to the number of shares of common stock that would be held by each such
holder if all shares of Convertible Preferred Stock were converted to common stock at the then effective conversion price.

Optional Conversion Rights

Each  share  of  Convertible  Preferred  Stock  shall  be  convertible,  at  the  option  of  the  holder,  at  any  time  and  from  time  to  time,  and  without  the
payment  of  additional  consideration  by  the  holder  thereof,  into  such  number  of  fully  paid  shares  of  common  stock  as  is  determined  by  dividing  the
applicable  original  issuance  price  by  the  conversion  price  in  effect  at  the  time  of  conversion.  The  respective  applicable  conversion  prices  for  the
Convertible Preferred Stock is subject to adjustment upon any future stock split, stock dividend, combination, reclassification or similar event affecting the
Convertible  Preferred  Stock  or  any  series  thereof.  Such  applicable  conversion  prices  for  the  Convertible  Preferred  Stock  and  the  rate  at  which  the
Convertible Preferred Stock may be converted into shares of common stock, shall be subject to adjustment as provided. In connection with the IPO, each
1.5 outstanding share of Convertible Preferred Stock converted into one share of common stock.

Mandatory Conversion Rights

Each share of Convertible Preferred Stock automatically converts into the number of shares of common stock determined in accordance with the
conversion rate upon either: (a) the closing of a public offering of common stock at a price of at least $18.23 per share resulting in at least $50,000 of gross
proceeds, or (b) written consent of a majority of the holders of the then outstanding shares of Convertible Preferred Stock.

In the event of a mandatory conversion of Preferred Stock as a result of a Qualified IPO, each holder of Preferred Stock may elect to receive non-
voting Common Stock in lieu of all or a portion of such holder’s voting Common Stock. The non-voting shares of Common Stock shall have the same
rights  and  preferences  as  the  Common  Stock  but  shall  be  non-voting.  The  Convertible  Preferred  Stock  was  converted  into  6,495,015  shares  of  voting
Common Stock and 6,409,519 shares of non-voting Common Stock as a result of the Company’s IPO in October 2019. No Convertible Preferred Stock was
outstanding as of December 31, 2019.

F-18

 
 
Liquidation

The holders of Convertible Preferred Stock then outstanding shall be entitled to be paid (a) out of the consideration payable to stockholders in the
event  of  a  merger,  consolidation,  or  reorganization  involving  the  Company  or  a  subsidiary  or  on  the  sale,  lease,  transfer,  exclusive  license  or  other
disposition by the Company or a subsidiary of all or substantially all assets of the not elected otherwise by a requisite of holders of the Series A Preferred,
or (b) out of the available proceeds the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company, the holders of shares
of Convertible Preferred Stock then outstanding shall be entitled to be paid, on a pari passu basis,  before  any  payment  shall  be  made  to  the  holders  of
common stock by reason of their ownership thereof, an amount per share equal to the greater of (i) the applicable original issue price, plus any dividends
declared but unpaid thereon, or (ii) such amount per share as would have been payable had all shares of Convertible Preferred Stock been converted into
common stock immediately prior to such event. If upon any such event, the assets of the Company available for distribution to its stockholders shall be
insufficient to pay the holders of the outstanding shares of Convertible Preferred Stock the full amount to which they shall be entitled, the holders of shares
of  Convertible  Preferred  Stock  shall  share  ratably,  on  a  pari  passu  basis,  in  any  distribution  of  the  assets  available  for  distribution  in  proportion  to  the
respective  amounts  which  would  otherwise  be  payable  in  respect  of  the  shares  held  by  them  upon  such  distribution  if  all  amounts  payable  on  or  with
respect to such shares were paid in full.

Anti-Dilution

Holders  of  Convertible  Preferred  Stock  are  afforded  certain  anti-dilution  protection  with  respect  to  corporate  events  such  as  stock  splits  and

recapitalizations.

Redemption

The Company’s Convertible Preferred Stock is not redeemable but does contain deemed liquidation rights in the event of a merger, consolidation,
or  reorganization  involving  the  Company  or  a  subsidiary  or  on  the  sale,  lease,  transfer,  exclusive  license  or  other  disposition  by  the  Company  or  a
subsidiary of all or substantially all assets of the Company, and unless elected otherwise by a requisite of holders of the Series A Preferred.

9. Common Stock

Common Stock

Pursuant  to  the  Amended  and  Restated  Certificate  of  Incorporation  filed  in  August  2018,  the  Company  was  authorized  to  issue  a  total  of
21,147,115  shares  of  common  stock,  of  which  3,848,320  shares  were  issued  and  outstanding  at  December  31,  2018.  In  January  2019,  the  Company’s
certificate  of  incorporation  was  further  amended  to  authorize  the  issuance  of  29,000,000  shares  of  common  stock.  In  October  2019,  the  Company’s
certificate of incorporation was further amended to authorize the issuance of 143,590,481 shares of voting common stock and 6,409,519 shares of non-
voting common stock. Holders of voting common stock shall have the exclusive right to vote for the election of directors of the Company and on all other
matters requiring stockholder action.

In connection with the issuance of the Notes in May 2018 (Note 6), several of the Company’s founders agreed to modify their shares of common
stock  outstanding  to  include  vesting  provisions  that  require  continued  service  to  the  Company  in  order  to  vest  in  those  shares.  As  such,  the  2,904,000
modified shares of common stock became compensatory upon such modification. The fair value of the awards on the modification date was determined to
be $0.74 per share of common stock, by calibrating to the recent Notes issuance considering the maximum conversion price and the seniority of the Notes.
The total compensation cost resulting from the modification was $2,126. The total compensation cost is being recognized over the three-year vesting term
attendant to the founders’ common shares. During the year ended December 31, 2019, the Company recognized $529 and $177 of this amount in research
and development expense and general and administrative expense, respectively. During the year ended December 31, 2018, the Company recognized $399
and $118 of this amount in research and development expense and general and administrative expense, respectively.

F-19

 
 
 
Common  stockholders  are  entitled  to  dividends,  if  and  when  declared  by  the  board  of  directors,  subject  to  the  prior  rights  of  the  Convertible

Preferred Stockholders. As of December 31, 2019, no dividends on common stock had been declared.

Non-Voting Common Stock Election

In October 2019, certain holders of the Company’s Convertible Preferred Stock elected to have such shares convert into 6,409,519 shares of non-
voting Common Stock following the closing of the Company’s IPO. The non-voting shares of Common Stock shall have the same rights and preferences as
the Common Stock, but shall be non-voting.

2018 Stock Option and Grant Plan

In September 2018, the Company adopted the 2018 stock option and grant plan (the 2018 Plan), which provided for the Company to sell or issue
common  stock,  or  other  stock-based  awards,  to  employees,  members  of  the  board  of  directors  and  consultants  of  the  Company.  The  2018  Plan  was
administered by the board of directors, or at the discretion of the board of directors, by a committee of the board of directors. The exercise prices, vesting
and other restrictions were determined at the discretion of the board of directors, or their committee if so delegated, except that the exercise price per share
of stock options may not be less than 100% of the fair market value of the share of common stock on the date of grant and the term of stock option may not
be greater than 10 years. The Company generally granted stock-based awards with service conditions only (service-based awards), although there has been
one grant with performance conditions. Stock options granted under the 2018 Plan generally vest over three to four years. There were 1,959,411 options
granted under the 2018 Plan prior to the plan termination upon consummation of the Company’s IPO in October 2019.

2019 Stock Option and Incentive Plan

The  2019  Stock  Option  and  Incentive  Plan  (2019  Plan)  was  approved  by  the  Company’s  board  of  directors  on  October  14,  2019,  and  became
effective  on  October  23,  2019.  The  2019  Plan  provides  for  the  grant  of  incentive  stock  options,  nonqualified  stock  options,  stock  appreciation  rights,
restricted  stock  units,  restricted  stock  awards,  unrestricted  stock  awards,  cash-based  awards  and  dividend  equivalent  rights  to  the  Company’s  officers,
employees, directors and consultants. The number of shares initially reserved for issuance under the 2019 Plan is 2,342,288, which shall be cumulatively
increased  on  January  1,  2020  and  each  January  1  thereafter  by  4%  of  the  number  of  shares  of  the  Company’s  common  stock  outstanding  on  the
immediately preceding December 31 or such lesser number of shares determined by the Company’s board of directors or compensation committee of the
board of directors.

A summary of the stock option activity under the 2018 Plan and the 2019 Plan is presented below:

Outstanding as of January 1, 2018

Granted

Outstanding as of December 31, 2018

Granted
Exercised
Cancelled

Outstanding as of December 31, 2019

Options Exercisable at December 31, 2019

Number of
Shares

—    $
971,353     
971,353     
1,340,839     
(5,667)    
(176,893)    
2,129,632    $

365,385    $

Weighted
Average
Exercise
Price

Weighted
Average
Remaining
Contractual
Term (years)

Aggregate
Intrinsic
Value

—     
1.01     
1.01     
7.97     
1.01     
4.22     
5.12     

1.61     

—    $

— 

9.8    $

4,051 

9.2    $

8.9    $

18,844 

4,516

The aggregate intrinsic value of options granted is calculated as the difference between the exercise price of the options and the estimated fair value
of the Company’s common stock. The weighted average grant-date fair value of stock options granted during the year ended December 31, 2019 and 2018
was $5.24 and $1.91,

F-20

 
 
 
 
 
 
 
 
 
 
 
   
   
      
  
   
   
      
  
   
      
  
   
      
  
   
   
 
 
 
respectively. The aggregate grant-date fair value of options vested during the year ended December 31, 2019 and 2018 was $753 and $26, respectively.

The fair value of each award is estimated using Black-Scholes based on the following assumptions:

Risk-free interest rate
Expected term
Expected volatility
Expected dividend yield

For the Year Ended December 31,

2019

2018

1.39%—2.59% 
0.3—6.1 years 
70%—76% 
0% 

2.92%—2.96%
5.5—6.2 years
72%
0%

Black-Scholes requires the use of subjective assumptions which determine the fair value of stock-based awards. These assumptions include:

Fair  value  of  common  stock—Historically,  because  there  has  been  no  public  market  for  the  Company’s  common  stock,  the  fair  value  of  the
Company’s  common  stock  underlying  stock-based  awards  was  estimated  on  each  grant  date  by  the  Company’s  board  of  directors.  In  order  to
determine the fair value of the Company’s common stock underlying stock-based awards, the Company’s board of directors considered, among
other  things,  a  valuation  of  the  Company’s  common  stock  prepared  by  an  unrelated  third-party  valuation  firm  in  accordance  with  the  guidance
provided by the American Institute of Certified Public Accountants Practice Guide, Valuation of Privately-Held-Company Equity Securities Issued
as Compensation.

Expected term—The  expected  term  represents  the  period  that  stock-based  awards  are  expected  to  be  outstanding.  The  expected  term  for  option
grants  is  determined  using  the  simplified  method.  The  simplified  method  deems  the  term  to  be  the  average  of  the  time-to-vesting  and  the
contractual life of the stock-based awards.

Expected volatility—As  a  privately  held  company  historically,  the  Company  has  limited  trading  history  for  its  common  stock  and,  as  such,  the
expected volatility is estimated based on the average volatility for comparable publicly traded biotechnology companies over a period equal to the
expected  term  of  the  stock-based  awards.  The  comparable  companies  were  chosen  based  on  their  similar  size,  stage  in  the  life  cycle  or  area  of
specialty. The Company will continue to apply this process until a sufficient amount of historical information regarding the volatility of its own
stock price becomes available.

Risk-free  interest  rate—The  risk-free  interest  rate  is  based  on  the  U.S.  Treasury  zero  coupon  issues  in  effect  at  the  time  of  grant  for  periods
corresponding with the expected term of a stock-based award.

Expected  dividend—The  Company  has  never  paid  dividends  on  its  common  stock  and  has  no  plans  to  pay  dividends  on  its  common  stock.
Therefore, the Company used an expected dividend yield of zero.

Stock-based Compensation

The Company has recorded stock-based compensation in the accompanying statements of operations as follows:

Research and development
General and administrative

Total

For the Year Ended December 31,

2019

2018

  $

  $

1,304    $
996   
2,300    $

455 
151 
606

As of December 31, 2019, there was $6,797 of unrecognized compensation cost related to unvested option awards, including $176 with respect to
one grant with performance-based vesting terms, which is expected to be recognized over a weighted-average period of 2.2 years. As of December 31,
2019, there was $912 of unrecognized compensation cost related to unvested founder stock awards, which is expected to be recognized over a weighted-
average period of 1.3 years.

F-21

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2019 Employee Stock Purchase Plan

The  2019  Employee  Stock  Purchase  Plan  (2019  ESPP)  was  approved  by  the  Company’s  board  of  directors  on  October  14,  2019,  and  became
effective  on  October  23,  2019.  A  total  of  234,229  shares  of  common  stock  were  initially  reserved  for  issuance  under  the  2019  ESPP,  which  shall  be
cumulatively increased on January 1, 2020 and each January 1 thereafter through January 1, 2029 by the least of (i) 234,229 shares of common stock, (ii)
1% of the number of shares of the Company’s common stock outstanding on the immediately preceding December 31 or (iii) such lesser number of shares
determined by the 2019 ESPP’s administrator. The 2019 ESPP allows eligible employees to purchase shares during certain offering periods.

10. Income Taxes

The reconciliation of federal statutory income tax rate to the Company’s effective income tax rate is as follows:

Expected income tax benefit at the federal statutory rate
State and local taxes, net of federal benefit
Research and development credit, net
Non-deductible items
Change in valuation allowance

Total

For the Year Ended December 31,
2018
2019

21.0%  
13.1 
2.3 
(3.3)  
(33.1)  
0.0%  

21.0%
7.9 
0.6 
(16.8)
(12.7)
0.0%

Deferred income taxes reflect the net effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting

purposes and the amounts used for income tax purposes. The principal components of the Company’s deferred tax assets consisted of the following:

Deferred tax assets:

Federal, state and local net operating loss carryforwards
License fee deductions
Research and development tax credits
Stock-based compensation deductions
Accrued expenses

Gross deferred tax assets

Less: valuation allowance
Total deferred tax assets
Deferred tax liabilities:

Net deferred tax assets

December 31,

2019

2018

  $

  $
  $

5,688    $
362   
452   
264   
457   
7,223   
(7,223)  
—   
—   
—    $
—    $

1,163 
328 
69 
17 
35 
1,612 
(1,612)
— 
— 
— 
—

The Company increased its valuation allowance by $5,611 for the year ended December 31, 2019 in order to maintain a full valuation allowance
against its deferred tax assets. Based on the Company’s history of losses, the Company recorded a full valuation allowance against its deferred tax assets as
of  December  31,  2019.  The  Company  intends  to  maintain  a  valuation  allowance  until  sufficient  positive  evidence  exists  to  support  a  reversal  of  the
allowance.

As  of  December  31,  2019,  the  Company  had  federal,  state  and  local  net  operating  loss  carryforwards  of  $17,480,  $19,220  and  $10,129,
respectively; $17,231 of the federal amounts do not expire, and the remaining $249 expire in 2037. The state net operating losses begin to expire in 2037.
The local net operating losses expire in 2039. As of December 31, 2019, the Company had federal research and development tax credit carryforwards of
$452, which begin to expire in 2038. Under the provisions of Sections 382 and 383 of the Internal Revenue Code of 1986,

F-22

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
as amended (the IRC), these net operating losses, credit carryforwards and other tax attributes may be subject to limitation based on previous significant
changes in ownership and upon future significant changes in ownership of the Company, as defined by the IRC.

The Company files income tax returns in the U.S. federal jurisdiction as well as in Pennsylvania and Philadelphia. The tax years 2018 and 2017

remain open to examination by the jurisdictions where the Company is subject to tax.

The  Company  evaluates  tax  positions  for  recognition  using  a  more-likely-than-not  recognition  threshold,  and  those  tax  positions  eligible  for
recognition are measured as the largest amount of tax benefit that is greater than 50% likely of being realized upon the effective settlement with a taxing
authority that has full knowledge of all relevant information.

11. Net Loss Per Share

For the year ended December 31, 2019, the Company had voting and non-voting common stock outstanding. Since the rights of the voting and non-
voting common stock are identical, except with respect to voting, the undistributed losses of the Company have been allocated on a proportionate basis to
the two classes. Diluted net loss per share is calculated using the if-converted method, which assumes conversion of all non-voting common stock to voting
common stock.

  Voting common stock  

Non-voting common
stock

Basic net loss per share:

Numerator

Allocation of undistributed losses attributable to common stockholders

  $

(17,693)   $

(4,576)

Denominator

Weighted average number of shares used in basic per share computation

Net loss per share, basic

Diluted net loss per share:

Numerator

Allocation of undistributed losses for basic computation
Reallocation of undistributed losses as a result of conversion of
     non-voting to voting common shares
Allocation of undistributed losses

Denominator

Weighted average number of shares used in basic per share computation
Add: Conversion of non-voting to voting common shares outstanding
Weighted average number of shares used in diluted per share computation

  $

  $

  $

4,345,530   

(4.07)   $

1,123,861 
(4.07)

(17,693)   $

(4,576)  
(22,269)   $

4,345,530   
1,123,861   
5,469,391   

(4,576)

— 
(4,576)

1,123,861 
— 
1,123,861 
(4.07)

Net loss per share, diluted

  $

(4.07)   $

F-23

 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
For the year ended December 31, 2018, basic and diluted net loss per share is:

Basic and diluted net loss per share:

Numerator

Net loss attributable to common stockholders

Denominator

Weighted average number of shares used in basic and
     diluted per share computation

Net loss per share, diluted

Common stock

$

$

(12,202)

1,775,468 
(6.87)

The following outstanding potentially dilutive shares have been excluded from the calculation of diluted net loss per share, as their effect is anti-

dilutive:

Convertible preferred stock
Stock options to purchase common stock
Non-vested founder stock
Total

12. 401(k) Savings Plan

For the Year Ended December 31,

2019

2018

—   
2,129,632   
1,388,977   
3,518,609   

12,393,047 
971,353 
2,384,754 
15,749,154

The  Company  maintains  a  defined-contribution  savings  plan  under  Section  401(k)  of  the  IRC,  or  the  401(k)  Plan.  The  401(k)  Plan  covers  all
employees who meet defined minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pretax
basis. In 2019, the Company made a safe harbor nonelective contribution of 3% of eligible compensation on behalf of all employees. Effective January 1,
2020, the Plan provides for matching contributions on a portion of participant contributions pursuant to the 401(k) Savings Plan’s matching formula, up to
4%  of  eligible  compensation.  All  matching  contributions  and  participant  contributions  vest  immediately.  Contributions  totaled  $74  and  $0  for  the  years
ended December 31, 2019 and 2018, respectively, and have been recorded in the statements of operations.

F-24

 
 
 
 
 
 
 
  
 
 
  
 
 
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number 

EXHIBIT INDEX

Description

3.1

  Third Amended and Restated Certificate of Incorporation of the Registrant, as currently in effect (incorporated by reference to Exhibit

3.1 of the Registrant’s Current Report on Form 8-K (File No. 001-39103) filed on October 30, 2019)

3.2

  Amended and Restated Bylaws of the Registrant, as currently in effect (incorporated by reference to Exhibit 3.2 of the Registrant’s

Current Report on Form 8-K (File No. 001-39103) filed on October 30, 2019)

4.1

  Specimen Common Stock Certificate (incorporated by reference to Exhibit 4.1 of the Registrant’s Registration Statement on Form S-

1 (File No. 333-234017) filed on October 16, 2019)

4.2

  Amended  and  Restated  Investors'  Rights  Agreement  among  the  Registrant  and  certain  of  its  stockholders,  dated  January  2,  2019
(incorporated  by  reference  to  Exhibit  4.2  of  the  Registrant’s  Registration  Statement  on  Form  S-1  (File  No.  333-234017)  filed  on
September 30, 2019)

4.3*

  Description of Securities

10.1#   2018 Stock Option and Grant Plan, as amended, and form of award agreements thereunder (incorporated by reference to Exhibit 10.1

of the Registrant’s Registration Statement on Form S-1 (File No. 333-234017) filed on September 30, 2019)

10.2#   2019 Stock Option and Incentive Plan, and form of award agreements thereunder. (incorporated by reference to Exhibit 10.2 of the

Registrant’s Registration Statement on Form S-1/A (File No. 333-234017) filed on October 16, 2019)

10.3#   2019 Employee Stock Purchase Plan. (incorporated by reference to Exhibit 10.3 of the Registrant’s Registration Statement on Form

S-1/A (File No. 333-234017) filed on October 16, 2019)

10.4#   Senior Executive Cash Incentive Bonus Plan (incorporated by reference to Exhibit 10.4 of the Registrant’s Quarterly Report on Form

10-Q filed on December 5, 2019)

10.5#   Form of Indemnification Agreement between the Registrant and each of its directors (incorporated by reference to Exhibit 10.5 of the

Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

10.6#   Form of Indemnification Agreement between the Registrant and each of its executive officers (incorporated by reference to Exhibit

10.4 of the Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

10.7

10.8

10.9

  Amended  and  Restated  License  Agreement,  dated  as  of  July  23,  2019,  among  the  Registrant,  the  Trustees  of  the  University  of
Pennsylvania and the Children’s Hospital of Philadelphia (incorporated by reference to Exhibit 10.6 to the Registrant’s Registration
Statement on Form S-1, filed with the SEC on September 30, 2019)

  Sponsored  Research  Agreement,  dated  as  of  April  23,  2018,  between  the  Registrant  and  the  Trustees  of  the  University  of
Pennsylvania (incorporated by reference to Exhibit 10.7 to the Registrant’s Registration Statement on Form S-1, filed with the SEC
on September 30, 2019)

  Sponsored  Research  Agreement,  dated  as  of  April  23,  2018,  between  the  Registrant  and  the  Trustees  of  the  University  of
Pennsylvania (incorporated by reference to Exhibit 10.8 to the Registrant’s Registration Statement on Form S-1, filed with the SEC
on September 30, 2019)

131

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10.10

10.11

10.12

10.13

  Master  Translational  Research  Services  Agreement,  dated  as  of  October  2018,  between  the  Registrant  and  the  Trustees  of  the
University of Pennsylvania (incorporated by reference to Exhibit 10.9 to the Registrant’s Registration Statement on Form S-1, filed
with the SEC on September 30, 2019)

  CAROT Master Services Addendum to Master Translational Research Services Agreement, dated as of February 4, 2019, between
the  Registrant  and  the  Trustees  of  the  University  of  Pennsylvania  (incorporated  by  reference  to  Exhibit  10.10  to  the  Registrant’s
Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

  CVPF Master Services Addendum to Master Translational Research Services Agreement, dated as of October 22, 2018, between the
Registrant  and  the  Trustees  of  the  University  of  Pennsylvania  (incorporated  by  reference  to  Exhibit  10.11  to  the  Registrant’s
Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

  Research  Agreement  A19-3095,  dated  as  of  October  31,  2018,  between  the  Registrant  and  The  Regents  of  the  University  of
California (incorporated by reference to Exhibit 10.12 to the Registrant’s Registration Statement on Form S-1, filed with the SEC on
September 30, 2019)

10.14

  Lease, dated as of February 11, 2019, between the Registrant and Brandywine Cira, L.P. (incorporated by reference to Exhibit 10.13

to the Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

10.15

  Consulting Agreement, dated as of May 7, 2018, between the Registrant and Danforth Advisors, LLC (incorporated by reference to

Exhibit 10.14 to the Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

10.16

  Amendment  No.  1  to  Consulting  Agreement,  dated  as  of  May  7,  2019,  between  the  Registrant  and  Danforth  Advisors,  LLC
(incorporated by reference to Exhibit 10.15 to the Registrant’s Registration Statement on Form S-1, filed with the SEC on September
30, 2019)

10.17#   Employment  Agreement  between  the  Registrant  and  Steven  Nichtberger  (incorporated  by  reference  to  Exhibit  10.16  to  the

Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

10.18#   Employment  Agreement  between  the  Registrant  and  Anup  Marda  (incorporated  by  reference  to  Exhibit  10.17  to  the  Registrant’s

Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

10.19#   Employment  Agreement  between  the  Registrant  and  Gwendolyn  Binder  (incorporated  by  reference  to  Exhibit  10.18  to  the

Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

10.20#   Employment Agreement between the Registrant and David Chang (incorporated by reference to Exhibit 10.19 to the Registrant’s

Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

10.21#   Employment  Agreement  between  the  Registrant  and  Brian  Stalter  (incorporated  by  reference  to  Exhibit  10.20  to  the  Registrant’s

Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

10.22#*  Non-Employee Director Compensation Policy

21.1*

  List of Subsidiaries of the Registrant

23.1*

  Consent of Ernst & Young, independent registered public accounting firm

132

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
31.1*

  Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934,

as amended

31.2*

  Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934,

as amended

32.1**

  Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to 18 U.S.C. Section 1350, as

adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

32.2**

  Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to 18 U.S.C. Section 1350, as

adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

101.INS   XBRL Instance Document

101.SCH  XBRL Taxonomy Extension Schema Document

101.CAL  XBRL Taxonomy Extension Calculation Linkbase Document

101.DEF   XBRL Taxonomy Extension Definition Linkbase Document

101.LAB  XBRL Taxonomy Extension Label Linkbase Document

101.PRE   XBRL Taxonomy Extension Presentation Linkbase Document

#
+
*
**

Management Contract or compensatory plan or arrangement.
Confidential treatment has been granted by the Securities and Exchange Commission as to certain portions.
Filed herewith.
The certifications furnished in Exhibit 32.1 and 32.2 hereto are deemed to accompany this Annual Report on Form 10-K and will not be deemed
“filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended. Such certifications will not be deemed to be incorporated
by  reference  into  any  filings  under  the  Securities  Act  of  1933,  as  amended,  or  the  Securities  Exchange  Act  of  1934,  as  amended,  except  to  the
extent that the Registrant specifically incorporates it by reference.

133

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Form

10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

SIGNATURES

Date: March 30, 2020

Cabaletta Bio, Inc.

By:

/s/ Steven Nichtberger
Steven Nichtberger
Chief Executive Officer and President

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this Annual Report on Form 10-K has been signed below by the

following persons on behalf of the Registrant in the capacities and on the dates indicated.

Name

Title

Date

/s/ Steven Nichtberger
Steven Nichtberger

Director, Chief Executive Officer and President

  March 30, 2020

  (Principal Executive Officer)

/s/ Anup Marda
Anup Marda

Chief Financial Officer

  (Principal Financial and Accounting Officer)

/s/ Catherine Bollard
Catherine Bollard

/s/ Brian Daniels
Brian Daniels

/s/ Richard Henriques
Richard Henriques

/s/ Mark Simon
Mark Simon

Director

Director

Director

Director

134

  March 30, 2020

  March 30, 2020

  March 30, 2020

  March 30, 2020

  March 30, 2020

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 4.3

Description of the Registrant’s Securities Registered Pursuant to
Section 12 of the Securities Exchange Act of 1934, as amended

The following summary of the general terms and provisions of the registered capital stock of Cabaletta Bio, Inc. (“Cabaletta”, “we”, “our”) does not
purport to be complete and is subject to, and qualified in its entirety by, reference to our Third Amended and Restated Certificate of Incorporation, or
certificate of incorporation, our Amended and Restated Bylaws, or bylaws, each of which is incorporated by reference as an exhibit to our most recent
Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission, and applicable provisions of the Delaware General Corporation Law,
or the DGCL. Our common stock, par value $0.00001 per share is registered pursuant to Section 12(b) of the Securities and Exchange Act of 1934 and
trades on the Nasdaq Global Select Market under the symbol CABA.  The summaries below do not purport to be complete statements of the relevant
provisions of the certificate of incorporation, the bylaws or the DGCL.

General

Our authorized capital stock consists of one hundred and forty-three million five hundred and ninety thousand four hundred and eighty-one (143,590,481)
shares of common stock, par value $0.00001 per share, or the common stock, six million four hundred and nine thousand five hundred and nineteen
(6,409,519) shares of non-voting common stock, par value $0.00001 per share, or the non-voting common stock, and ten million (10,000,000) shares of
undesignated preferred stock, par value $0.00001 per share, or the preferred stock.

Common Stock and Non-Voting Common Stock

The holders of our common stock and non-voting common stock have identical rights, provided that, (i) except as otherwise expressly provided in our
certificate of incorporation or as required by applicable law, on any matter that is submitted to a vote by our stockholders, holders of our common stock are
entitled to one vote per share of common stock, and holders of our non-voting common stock are not entitled to any votes per share of non-voting common
stock, including for the election of directors, and (ii) holders of our common stock have no conversion rights, while holders of our non-voting common
stock shall have the right to convert each share of our non-voting common stock into one share of common stock at such holder’s election, provided that as
a result of such conversion, such holder, together with its affiliates and any members of a Schedule 13(d) group with such holder, would not beneficially
own in excess of 4.99% of our common stock immediately prior to and following such conversion, unless otherwise as expressly provided for in our
certificate of incorporation. However, this ownership limitation may be increased or decreased to any other percentage designated by such holder of non-
voting common stock upon 61 days’ notice to us.

Holders of our common stock and non-voting common stock are entitled to receive ratably any dividends declared by our board of directors out of funds
legally available for that purpose, subject to any preferential dividend rights of any outstanding preferred stock. Our common stock and non-voting
common stock have no preemptive rights or other subscription rights or redemption or sinking fund provisions.

In the event of our liquidation, dissolution or winding up, holders of our common stock and non-voting common stock will be entitled to share ratably in all
assets remaining after payment of all debts and other liabilities and any liquidation preference of any outstanding preferred stock.

Our common stock is listed on the Nasdaq Global Select Market under the trading symbol “CABA.”

The transfer agent and registrar for our common stock is American Stock Transfer & Trust Company.

Preferred Stock

 
 
 
 
 
 
Our board of directors will have the authority, from time to time, without further action by our stockholders, to issue up to 10,000,000 shares of preferred
stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof. These rights, preferences and privileges could include
dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting, or
the designation of, such series, any or all of which may be greater than the rights of common stock and non-voting common stock. The issuance of our
preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders and holders of our non-voting
common stock will receive dividend payments and payments upon our liquidation. In addition, the issuance of preferred stock could have the effect of
delaying, deferring or preventing a change in control of our company or other corporate action.

Registration Rights

Certain holders of our shares of our common stock and non-voting common stock, including those issuable upon the conversion of preferred stock, will be
entitled to rights with respect to the registration of these securities under the Securities Act. These rights are provided under the terms of an investors’
rights agreement between us and holders of our preferred stock. The investors’ rights agreement includes demand registration rights, short-form registration
rights and piggyback registration rights. All fees, costs and expenses of underwritten registrations under this agreement will be borne by us and all selling
expenses, including underwriting discounts and selling commissions, will be borne by the holders of the shares being registered.

Demand Registration Rights

Upon or after the expiration of the 180-day lock-up period under our registration statement for our initial public offering, or our IPO, holders of our
common stock and non-voting common stock, including those issuable upon the conversion of preferred stock, will be entitled to demand registration
rights. Under the terms of the investors’ rights agreement, we will be required, upon the written request of holders of at least 40% of these securities, to file
a registration statement and use commercially reasonable efforts to effect the registration of all or a portion of these shares of common stock (including the
shares of common stock into which any shares of non-voting common stock held by such investors may be converted) for public resale. We are required to
effect only two registrations pursuant to this provision of the investors’ rights agreement.

Short-Form Registration Rights

Pursuant to the investors’ rights agreement, if we are eligible to file a registration statement on Form S-3, upon the written request of holders of at least
20% of these securities at an aggregate offer price of at least $5.0 million, we will be required to use commercially reasonable efforts to effect a registration
of such shares. We are required to effect only two registrations in any twelve month period pursuant to this provision of the investors’ rights agreement.
The right to have such shares registered on Form S-3 is further subject to other specified conditions and limitations.

Piggyback Registration Rights

Pursuant to the investors’ rights agreement, if we register any of our securities either for our own account or for the account of other security holders, the
holders of these shares are entitled to include their shares in the registration. Subject to certain exceptions contained in the investors’ rights agreement, we
and the underwriters may limit the number of shares included in the underwritten offering to the number of shares which we and the underwriters determine
in our sole discretion will not jeopardize the success of the offering.

Indemnification

Our investors’ rights agreement contains customary cross-indemnification provisions, under which we are obligated to indemnify holders of registrable
securities in the event of material misstatements or omissions in the registration statement attributable to us, and they are obligated to indemnify us for
material misstatements or omissions attributable to them.

Expiration of Registration Rights

 
 
 
The demand registration rights and short form registration rights granted under the investors’ rights agreement will terminate on the earliest of (i) a deemed
liquidation event, as defined in the investors’ rights agreement, (ii) the fifth anniversary of our IPO and (iii) at such time when the holders’ shares may be
sold without restriction pursuant to Rule 144 within a three month period.

In addition, we have entered into a side letter with certain of our investors pursuant to which, upon or after expiration of the lock-up agreements, if we
receive a written notice from any of such investors, we and the investors will enter into a registration rights agreement. The registration rights agreement
will provide that, subject to certain limitations, upon demand by any of the investors, we must file a Registration Statement on Form S-3 for resale under
the Securities Act of 1933 registering the common stock held by the investors (including any shares of common stock into which outstanding shares of
non-voting common stock may be converted) and use reasonable best efforts to effect such registration. If we enter into the registration rights agreement,
our registration obligations will continue in effect for up to ten years. The registration rights agreement also requires us to pay expenses relating to such
registrations and indemnify the investors against certain liabilities.

Anti-Takeover Effects of our Certificate of Incorporation and Bylaws and Delaware Law

Our certificate of incorporation and bylaws include a number of provisions that may have the effect of delaying, deferring or preventing another party from
acquiring control of us and encouraging persons considering unsolicited tender offers or other unilateral takeover proposals to negotiate with our board of
directors rather than pursue non-negotiated takeover attempts. These provisions include the items described below.

Board Composition and Filling Vacancies

Our certificate of incorporation provides for the division of our board of directors into three classes serving staggered three-year terms, with one class being
elected each year. Our certificate of incorporation provides that directors may be removed only for cause and then only by the affirmative vote of the
holders of 75% or more of the outstanding shares then entitled to vote at an election of directors. Furthermore, any vacancy on our board of directors,
however occurring, including a vacancy resulting from an increase in the size of our board, may only be filled by the affirmative vote of a majority of our
directors then in office even if less than a quorum. The classification of directors, together with the limitations on removal of directors and treatment of
vacancies, has the effect of making it more difficult for stockholders to change the composition of our board of directors.

No Written Consent of Stockholders

Our certificate of incorporation provides that all stockholder actions are required to be taken by a vote of the stockholders at an annual or special meeting,
and that stockholders may not take any action by written consent in lieu of a meeting. This limit may lengthen the amount of time required to take
stockholder actions and would prevent the amendment of our bylaws or removal of directors by our stockholders without holding a meeting of
stockholders.

Meetings of Stockholders

Our certificate of incorporation and bylaws provide that only a majority of the members of our board of directors then in office may call special meetings of
stockholders and only those matters set forth in the notice of the special meeting may be considered or acted upon at a special meeting of stockholders. Our
bylaws limit the business that may be conducted at an annual meeting of stockholders to those matters properly brought before the meeting.

Advance Notice Requirements

Our bylaws establish advance notice procedures with regard to stockholder proposals relating to the nomination of candidates for election as directors or
new business to be brought before meetings of our stockholders. These procedures provide that notice of stockholder proposals must be timely given in
writing to our corporate secretary prior to the meeting at which the action is to be taken. Generally, to be timely, notice must be received at our principal
executive offices not less than 90 days nor more than 120 days prior to the first anniversary date of the annual meeting for the preceding year. Our bylaws
specify the requirements as to form and content of all

 
 
 
stockholders’ notices. These requirements may preclude stockholders from bringing matters before the stockholders at an annual or special meeting.

Amendment to Certificate of Incorporation and Bylaws

Any amendment of our certificate of incorporation must first be approved by a majority of our board of directors, and, if required by law, our certificate of
incorporation must thereafter be approved by a majority of the outstanding shares entitled to vote on the amendment and a majority of the outstanding
shares of each class entitled to vote thereon as a class, except that the amendment of the provisions relating to stockholder action, board composition,
limitation of liability and the amendment of our bylaws and certificate of incorporation must be approved by not less than 75% of the outstanding shares
entitled to vote on the amendment, and not less than 75% of the outstanding shares of each class entitled to vote thereon as a class. Our bylaws may be
amended by the affirmative vote of a majority of the directors then in office, subject to any limitations set forth in the bylaws; and may also be amended by
the affirmative vote of at least 75% of the outstanding shares entitled to vote on the amendment, or, if our board of directors recommends that the
stockholders approve the amendment, by the affirmative vote of the majority of the outstanding shares entitled to vote on the amendment, in each case
voting together as a single class.

Undesignated Preferred Stock

Our certificate of incorporation authorizes 10,000,000 shares of preferred stock. The existence of authorized but unissued shares of preferred stock may
enable our board of directors to discourage an attempt to obtain control of us by means of a merger, tender offer, proxy contest or otherwise. For example,
if in the due exercise of its fiduciary obligations, our board of directors were to determine that a takeover proposal is not in the best interests of our
stockholders, our board of directors could cause shares of preferred stock to be issued without stockholder approval in one or more private offerings or
other transactions that might dilute the voting or other rights of the proposed acquirer or insurgent stockholder or stockholder group. In this regard, our
certificate of incorporation grants our board of directors broad power to establish the rights and preferences of authorized and unissued shares of preferred
stock. The issuance of shares of preferred stock could decrease the amount of earnings and assets available for distribution to holders of shares of common
stock. The issuance may also adversely affect the rights and powers, including voting rights, of these holders and may have the effect of delaying, deterring
or preventing a change in control of us.

Choice of forum

Our bylaws provide that, unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware will be the
sole and exclusive forum for any state law claim for: (1) any derivative action or proceeding brought on our behalf; (2) any action asserting a claim of
breach of a fiduciary duty or other wrongdoing by any of our directors, officers, employees or agents to us or our stockholders; (3) any action asserting a
claim against us arising pursuant to any provision of the DGCL or our certificate of incorporation or bylaws; (4) any action to interpret, apply, enforce or
determine the validity of our certificate of incorporation or bylaws or (5) any action asserting a claim governed by the internal affairs doctrine. The choice
of forum provision does not apply to any actions arising under the Securities Act or the Exchange Act.

Section 203 of the DGCL

We are subject to the provisions of Section 203 of the DGCL. In general, Section 203 prohibits a publicly held Delaware corporation from engaging in a
“business combination” with an “interested stockholder” for a three-year period following the time that this stockholder becomes an interested stockholder,
unless the business combination is approved in a prescribed manner. Under Section 203, a business combination between a corporation and an interested
stockholder is prohibited unless it satisfies one of the following conditions:

•

•

before the stockholder became interested, our board of directors approved either the business combination or the transaction which resulted in
the stockholder becoming an interested stockholder;\
upon consummation of the transaction which resulted in the stockholder becoming an interested stockholder, the interested stockholder owned
at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced, excluding for purposes of determining
the voting stock

 
 
 
 
•

outstanding, shares owned by persons who are directors and also officers, and employee stock plans, in some instances, but not the outstanding
voting stock owned by the interested stockholder; or
at or after the time the stockholder became interested, the business combination was approved by our board of directors and authorized at an
annual or special meeting of the stockholders by the affirmative vote of at least two-thirds of the outstanding voting stock which is not owned
by the interested stockholder.

Section 203 defines a business combination to include:

•
•
•

•

•

any merger or consolidation involving the corporation and the interested stockholder;
any sale, transfer, lease, pledge or other disposition involving the interested stockholder of 10% or more of the assets of the corporation;
subject to exceptions, any transaction that results in the issuance or transfer by the corporation of any stock of the corporation to the interested
stockholder;
subject to exceptions, any transaction involving the corporation that has the effect of increasing the proportionate share of the stock of any class
or series of the corporation beneficially owned by the interested stockholder; and
the receipt by the interested stockholder of the benefit of any loans, advances, guarantees, pledges or other financial benefits provided by or
through the corporation.

In general, Section 203 defines an interested stockholder as any entity or person beneficially owning 15% or more of the outstanding voting stock of the
corporation and any entity or person affiliated with or controlling or controlled by the entity or person.

 
 
 
 
 
 
 
 
 
 
Exhibit 10.22

CABALETTA BIO, INC.

AMENDED AND RESTATED NON-EMPLOYEE DIRECTOR
COMPENSATION POLICY

The purpose of this Amended and Restated Non-Employee Director Compensation Policy of Cabaletta Bio, Inc. (the
“Company”), is to provide a total compensation package that enables the Company to attract and retain, on a long-term basis,
high-caliber directors who are not employees or officers of the Company or its subsidiaries. In furtherance of the purpose stated
above, all non-employee directors shall be paid compensation for services provided to the Company as set forth below:

Cash Retainers

Annual  Retainer  for  Board  Membership:   $35,000 for  general  availability  and  participation  in meetings and conference
calls of our Board of Directors, to be paid quarterly in arrears, pro-rated based on the number of actual days served by the
director during such calendar quarter.

Additional Retainers for Committee Membership:

Audit Committee Chair:

Audit Committee member:

Compensation Committee Chair:

Compensation Committee member:

Nominating and Corporate Governance Committee
Chair:

Nominating and Corporate Governance Committee
member:

$15,000

$7,500

$10,000

$5,000

$8,000

$4,000

Note: Chair and committee member retainers are in addition to retainers for members of the Board of Directors.

Equity Retainers

Initial Award: An initial, one-time stock option award (the “Initial Award”) of 44,000 shares will be granted to each new non-
employee director upon his or her election to the Board of Directors, which shall vest in equal quarterly installments over three
years from the date of vesting commencement, provided, however, that all vesting shall cease if the director resigns from the
Board of Directors or otherwise ceases to serve as a director of the Company. The Initial Award shall expire ten years from the
date of grant, and shall have a per share exercise price equal to the Fair Market Value (as defined in the Company’s 2019 Stock
Option and Incentive Plan) of the Company’s common stock on the date of grant. This Initial Award

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
applies only to non-employee directors who are first elected to the Board of Directors subsequent to the Company’s initial
public offering.  

Annual Award:  Commencing in 2021, on each date of the Company’s Annual Meeting of Stockholders following the
completion of the Company’s initial public offering (the “Annual Meeting”), each continuing non-employee member of the
Board of Directors, other than a director receiving an Initial Award, will receive an annual stock option award (the “Annual
Award”) of 22,000 shares, which shall vest in full upon the earlier to occur of the first anniversary of the date of grant or the
date of the next Annual Meeting; provided, however, that all vesting shall cease if the director resigns from the Board of
Directors or otherwise ceases to serve as a director, unless the Board of Directors determines that the circumstances warrant
continuation of vesting.  Such Annual Award shall expire ten years from the date of grant, and shall have a per share exercise
price equal to the Fair Market Value (as defined in the Company’s 2019 Stock Option and Incentive Plan) of the Company’s
common stock on the date of grant.

Each Initial Award and Annual Award will become immediately vested and exercisable upon a Sale Event (as defined in the
Company’s 2019 Stock Option and Incentive Plan).

Expenses

The  Company will  reimburse  all  reasonable  out-of-pocket  expenses  incurred  by non-employee directors in attending
meetings of the Board or any Committee.

Adopted October 14, 2019, and effective as of October 24, 2019

Amended and restated effective as of February 11, 2020

 
 
 
 
 
 
None.

List of Subsidiaries

Exhibit 21.1

 
Consent of Independent Registered Public Accounting Firm

Exhibit 23.1

We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-234367) pertaining to the Cabaletta Bio, Inc. 2018 Stock
Option and Incentive Plan, the Cabaletta Bio, Inc. 2019 Stock Option and Incentive Plan, and the Cabaletta Bio, Inc. 2019 Employee Stock Purchase Plan
of our report dated March 30, 2020, with respect to the financial statements of Cabaletta Bio, Inc. included in this Annual Report (Form 10-K) for the year
ended December 31, 2019.

/s/ Ernst & Young LLP

Philadelphia, Pennsylvania
March 30, 2020

 
 
 
 
 
Exhibit 31.1

CERTIFICATION PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Steven Nichtberger, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K for the year ended December 31, 2019 of Cabaletta Bio, Inc. (the “registrant”);

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this
report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)

(b)

(c)

(d)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this report is being prepared;

(Paragraph omitted pursuant to SEC Release Nos. 33‑8238/34‑47986 and 33‑8392/34‑49313);

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most
recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely
to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

(b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal
control over financial reporting.

Date: March 30, 2020

By:

/s/ Steven Nichtberger
Steven Nichtberger
Chief Executive Officer and President
(Principal Executive Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 31.2

CERTIFICATION PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Anup Marda, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K for the year ended December 31, 2019 of Cabaletta Bio, Inc. (the "registrant");

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this
report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have:

(a)

(b)

(c)

(d)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this report is being prepared;

(Paragraph omitted pursuant to SEC Release Nos. 33‑8238/34‑47986 and 33‑8392/34‑49313);

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most
recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely
to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

(b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal
control over financial reporting.

Date: March 30, 2020

By:

/s/ Anup Marda
Anup Marda
Chief Financial Officer
(Principal Financial and Accounting Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.1

In connection with the Annual Report of Cabaletta Bio, Inc. (the “Company”) on Form 10-K for the fiscal year ended December 31, 2019 as filed

with the Securities and Exchange Commission on the date hereof (the “Report”), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the
Sarbanes-Oxley Act of 2002, that:

(1)

(2)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the
Company.

Date: March 30, 2020

By:

/s/ Steven Nichtberger
Steven Nichtberger
Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.2

In connection with the Annual Report of Cabaletta Bio, Inc. (the “Company”) on Form 10-K for the fiscal year ended December 31, 2019 as filed

with the Securities and Exchange Commission on the date hereof (the “Report”), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the
Sarbanes-Oxley Act of 2002, that:

(1)

(2)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the
Company.

Date: March 30, 2020

By:

/s/ Anup Marda
Anup Marda
Chief Financial Officer
(Principal Accounting and Financial Officer)