You should read the following discussion and analysis of our financial condition
and results of operations together with our unaudited condensed consolidated
financial statements and the related notes included elsewhere in this Quarterly
Report on Form 10-Q and our audited consolidated financial statements and notes
thereto and the related Management's Discussion and Analysis of Financial
Condition and Results of Operations included as part of our 2020 Annual Report
on Form 10-K as filed with the SEC on March 24, 2021 (2020 Form 10-K). This
discussion and analysis and other parts of this Quarterly Report on Form 10-Q
contain forward-looking statements based upon current beliefs, plans and
expectations related to future events and our future financial performance that
involve risks, uncertainties, and assumptions, such as statements regarding our
intentions, plans, objectives, and expectations for our business. Our actual
results and the timing of selected events could differ materially from those
described in or implied by these forward-looking statements as a result of
several factors, including those set forth in the section titled "Risk Factors."
See also the section titled "Special Note Regarding Forward-Looking Statements."

Overview



We were founded on the belief that engineered cells will be one of the most
important transformations in medicine over the next several decades. The burden
of diseases that can be addressed at their root cause through engineered cells
is significant. We view engineered cells as having the potential to be as
therapeutically disruptive as biologics to clinical practice. Our long-term
aspirations are to be able to control or modify any gene in the body, to replace
any cell that is damaged or missing, and to markedly improve access to cellular
and gene-based medicines. We have brought together an experienced group of
scientists, engineers, and company builders and combined them with the necessary
technologies to move this vision forward. We are developing in vivo and ex vivo
cell engineering platforms to revolutionize treatment across a broad array of
therapeutic areas with unmet treatment needs, including oncology, diabetes,
central nervous system disorders, cardiovascular diseases, and genetic
disorders, among others. While our current product candidates are all in
preclinical development, our goal is to file multiple investigational new drug
applications (INDs) both in 2022 and 2023.

The process of repairing and controlling genes in the body, referred to as gene
therapy or in vivo cell engineering, requires in vivo delivery of a therapeutic
payload and modification of the genome. Of these, we believe delivery of a
therapeutic payload represents the greatest unmet need and is thus at the core
of our strategic focus, with our ultimate goal being the delivery of any payload
to any cell in a specific and repeatable way. Our initial effort is on
cell-specific delivery and increasing the diversity and size of payloads. Using
our fusogen technology, we have shown in preclinical studies that we can
specifically target numerous cell surface receptors that, when combined with
delivery vehicles to form fusosomes, allow cell-specific delivery across
multiple different cell types. We have initially chosen to focus this technology
on delivering payloads to T cells, hepatocytes, and hematopoietic stem cells.

Frequently in disease, cells are damaged or missing entirely, and an effective
therapy needs to replace the entire cell, an approach referred to as cell
therapy or ex vivo cell engineering. A successful therapeutic requires an
ability to manufacture cells at scale that engraft, function, and have the
necessary persistence in the body. Of these, long-term persistence related to
overcoming immunologic rejection of another person's cells has been the most
challenging, which has led many to focus on autologous, or a patient's own,
cells as the therapeutic source. However, autologous therapies require a complex
process of harvesting cells from the patients, manipulating them outside the
body, and returning them to the patient. Products utilizing this approach have
had to manage significant challenges such as scalability, product variability,
product quality, cost, patient accessibility, and a limited number of cell types
being amenable to this approach. Given these limitations, rather than utilizing
autologous cells to overcome immune rejection, we have invested in creating
hypoimmune cells that can "hide" from the patient's immune system. We are
striving to make therapies utilizing pluripotent stem cells with our hypoimmune
genetic modifications as the starting material, which we then differentiate into
a specific cell type, such as a pancreatic beta cell, before treating the
patient. Additionally, for cell types for which effective differentiation
protocols from a stem cell have not yet been developed, such as T cells, instead
of starting from a pluripotent stem cell, we can utilize an allogeneic cell,
differentiated cells sourced from a donor, as the starting material to which we
then apply our hypoimmune genetic modifications.

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We believe the time is right to develop engineered cell therapies across a broad
range of therapeutic areas. Substantial progress in the understanding of
genetics, gene editing, gene control, protein engineering, stem cell biology,
immunology, process analytics, and computational biology have converged to
create an opportunity to markedly increase the breadth and depth of the
potential impact of genetic and cellular medicines. We are focused on creating
transformative in vivo and ex vivo engineered cell therapies across a range of
therapeutic areas. We are in the early stages of development across a broad
pipeline of product candidates, all of which are currently in the preclinical
stage of development and are summarized below:



                               [[Image Removed]]



We continue to make scientific progress on developing our cell engineering
platforms and advancing our product candidates through preclinical development
and towards potential IND submissions. Given the depth and breadth of our
portfolio, we expect to assess and prioritize our programs on an ongoing basis
based on various factors, including internal and external opportunities and
constraints, which may result in our decision to advance certain programs ahead
or instead of others. As certain of our product candidates advance towards
potential IND submissions, we are conducting GLP toxicity studies and
establishing necessary scale-up for our manufacturing processes.



Our ex vivo and in vivo technology represents an aggregation of years of
innovation and technology from multiple academic institutions and companies,
including our fusogen technology acquired from Cobalt Biomedicines Inc.
(Cobalt), our ex vivo cell engineering programs focused on replacing damaged
cells in the heart and certain brain disorders acquired from Cytocardia Inc. and
Oscine Corp., respectively, hypoimmune technology licensed from the President
and Fellows of Harvard College (Harvard) and The Regents of the University of
California, and genome editing technology licensed from Beam Therapeutics Inc.
(Beam), amongst others. For details regarding these acquisitions and license and
collaboration agreements, see Note 3, Acquisitions and Note 5, License and
collaboration agreements, to our consolidated financial statements included in
the 2020 Form 10-K, as well as the subsection titled "Business- Key Intellectual
Property Agreements" in Part I, Item 1, of our 2020 Form 10-K. For details
regarding our option and license agreement with Beam, see Note 17, Subsequent
events, to our unaudited condensed consolidated financial statements included
elsewhere in this Quarterly Report.

We were incorporated in July 2018, and our operations to date have included
developing our in vivo and ex vivo cell engineering platforms, identifying and
developing potential product candidates, executing preclinical studies,
establishing manufacturing capabilities, acquiring technology, organizing and
staffing the company, business planning, establishing our intellectual property
portfolio, raising capital, and providing general and administrative support for
these operations. All of our programs are currently in the development stage,
and we do not have any products approved for sale. Since our inception, we have
incurred net losses each year. Our net losses for the nine months ended
September 30, 2021 and 2020 were $245.2 million and $172.1 million,
respectively. As of September 30, 2021, we had an accumulated deficit of $674.6
million. Our net losses resulted primarily from our research and development
programs, and, to a lesser extent, general and administrative costs associated
with our operations. In addition, as of September 30, 2021, the accumulated
deficit of $674.6 million includes non-cash charges of $131.8 million and $80.7
million related to the revaluation of the success payment liabilities and
contingent consideration, respectively.

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In February 2021, we completed our initial public offering (IPO) and issued 27.0
million shares of our common stock, including 3.5 million shares pursuant to the
full exercise of the underwriters' option to purchase additional shares, at a
price of $25.0 per share and received net proceeds of $626.4 million. Prior to
the IPO, we funded our operations from the issuance and sale of our convertible
preferred stock, raising an aggregate of $705.5 million in gross proceeds. As of
September 30, 2021, we had cash, cash equivalents, and marketable securities of
$866.1 million. Based on our current operating plan, we believe that our
existing cash, cash equivalents, and marketable securities will be sufficient to
meet our working capital and capital expenditure needs for approximately the
next 36 months.

We anticipate that our expenses and operating losses will increase substantially
over the foreseeable future. The expected increase in expenses will be driven in
large part by our ongoing activities, if and as we continue to advance our in
vivo and ex vivo cell engineering platforms; continue preclinical development of
our current and future product candidates and initiate additional preclinical
studies; commence clinical studies of our current and future product candidates;
establish our manufacturing capability, including developing our contract
development and manufacturing relationships and building our internal
manufacturing facility; acquire and license technologies aligned with our in
vivo and ex vivo cell engineering platforms; seek regulatory approval of our
current and future product candidates; expand our operational, financial, and
management systems; increase personnel, including personnel to support our
preclinical and clinical development, manufacturing, and commercialization
efforts; continue to develop, grow, perfect, and defend our intellectual
property portfolio; and incur additional legal, accounting, or other expenses in
operating our business, including the additional costs associated with operating
as a public company.

We are also investing early in building world class capabilities in key areas of
manufacturing sciences and operations, including development of our in vivo and
ex vivo cell engineering platforms, product characterization, and process
analytics from the time candidates are in early research phases. Our investments
also include scaled research solutions, scaled infrastructure, and novel
technologies to improve efficiency, characterization, and scalability of
manufacturing, including establishing an internal manufacturing facility.

We anticipate that we will need to raise additional financing in the future to
fund our operations, including the commercialization of any approved product
candidates. Until such time, if ever, as we can generate significant product
revenue, we expect to finance our operations with our existing cash, cash
equivalents, and marketable securities, any future equity or debt financings,
and upfront, milestone, and royalty payments, if any, received under future
license or collaboration agreements. We may not be able to raise additional
capital on terms that are acceptable to us or at all. If we are unable to raise
additional capital when desired, our business, results of operations, and
financial condition would be adversely affected.

COVID-19 business update



The global COVID-19 pandemic continues to evolve rapidly, and we will continue
to monitor it closely. The extent of the impact of the COVID-19 pandemic on our
business, operations, and clinical development timelines and plans remains
uncertain and will depend on certain developments, including the duration and
spread of the pandemic and its impact on our ability to build out and
operationalize our manufacturing facility, clinical trial enrollment, trial
sites, contract research organizations (CROs), contract manufacturing
organizations, suppliers of key materials and supplies, including raw materials,
consumables, and other equipment necessary to manufacture our product
candidates, and other third parties with whom we do business, as well as its
impact on regulatory authorities and our key scientific and management
personnel. We have experienced modest delays in our discovery and development
activities as a result of the COVID-19 pandemic, primarily due to temporary and
partial shutdowns at certain of our CROs and academic institutions that have
since resumed operations, and due to the Washington, California, and
Massachusetts stay-at-home orders where our operations are located. However, to
the extent possible, we are conducting business as usual, with necessary or
advisable modifications to employee travel and most of our non-laboratory
employees working remotely. We will continue to actively monitor the situation
related to COVID-19 and may take further actions that alter our operations,
including those that may be required by federal, state, or local authorities, or
that we determine are in the best interests of our employees and other third
parties with whom we do business.

Acquisitions



We have completed various acquisitions since inception. For details regarding
our acquisitions, see Note 3, Acquisitions, to our consolidated financial
statements included in our 2020 Form 10-K, as well as the subsection titled
"Business-Key Intellectual Property Agreements" in Part I, Item 1 of our 2020
Form 10-K.

License and collaboration agreements



We have entered into license and collaboration arrangements with various third
parties. For details regarding these agreements, see Note 17, Subsequent events,
to our unaudited condensed consolidated financial statements included elsewhere
in this Quarterly Report, Note 5, License and collaboration agreements, to our
consolidated financial statements included in our 2020 Form 10-K, and the
subsection titled "Business- Key Intellectual Property Agreements" in Part I,
Item 1, of our 2020 Form 10-K.

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Success payments and contingent consideration

Cobalt success payment and contingent consideration



Pursuant to the terms of the Cobalt acquisition agreement, we have an obligation
to pay contingent consideration (Cobalt Contingent Consideration) of up to an
aggregate of $500.0 million to certain former Cobalt stockholders upon our
achievement of certain pre-specified development milestones (Cobalt Contingent
Consideration), and a success payment (Cobalt Success Payment) of up to $500.0
million payable in cash or stock, at our discretion. The Cobalt Success Payment
is payable, if at pre-determined valuation measurement dates, including our IPO
and periodically thereafter, our market capitalization equals or exceeds $8.1
billion, and we are advancing a program based on the fusogen technology in a
clinical trial pursuant to an IND, or have filed for, or received approval for,
a biologics license application (BLA) or new drug application (NDA). As of
September 30, 2021, a Cobalt Success Payment had not been triggered. In addition
to our IPO, a valuation measurement date would be triggered upon a change of
control if at least one of our programs based on the fusogen technology is the
subject of an active research program at the time of such change of control. If
there is a change of control and our market capitalization is below $8.1 billion
as of the date of the change of control, the amount of the potential Cobalt
Success Payment will decrease, and the amount of potential Cobalt Contingent
Consideration will increase. See Note 3, Acquisitions to our condensed
consolidated financial statements included elsewhere in this report for details
on the different market capitalizations and impact to the amount of the
potential Cobalt Success Payment and potential Cobalt Contingent Consideration
if there is a change of control.



As of September 30, 2021 and December 31, 2020, the estimated fair value of the
Cobalt Success Payment liability was $111.6 million and $64.7 million,
respectively, and was recorded in long-term liabilities in the condensed
consolidated balance sheets. In connection with the change in the estimated fair
value of the Cobalt Success Payment, we recognized expenses of $21.8 million and
$1.3 million for the three months ended September 30, 2021 and 2020,
respectively, and expenses of $46.9 million and $35.2 million for the nine
months ended September 30, 2021 and 2020, respectively.



As of September 30, 2021, the estimated fair value of the Cobalt Contingent
Consideration was $132.0 million, of which $43.5 million was recorded in
short-term liabilities and $88.5 million was recorded in long-term liabilities
in the condensed consolidated balance sheet. As of December 31, 2020, the
estimated fair value of the Cobalt Contingent Consideration of $121.9 million
was recorded in long-term liabilities in the condensed consolidated balance
sheet. In connection with the change in the estimated fair value of the Cobalt
Contingent Consideration, we recognized a gain of $8.5 million and expense of
$2.3 million for the three months ended September 30, 2021 and 2020,
respectively, and expenses of $10.1 million and $16.7 million for the nine
months ended September 30, 2021 and 2020, respectively.

See Part II, Item 7. Management's Discussion and Analysis of Financial Condition
and Results of Operations "-Critical accounting policies and significant
judgments and estimates-Success payments" and "-Critical accounting policies and
significant judgments and estimates-Contingent consideration" in our 2020 Form
10-K for more information on the accounting treatment of the Cobalt Success
Payment and Cobalt Contingent Consideration.

Harvard success payments



Pursuant to the terms of the Harvard agreement, we may be required to make
success payments up to an aggregate of $175.0 million, payable in cash, based on
increases in the per share fair market value of our common stock (Harvard
Success Payments). The potential Harvard Success Payments are based on multiples
of increased value ranging from 5x to 40x based on a comparison of the per share
fair market value of our common stock relative to the original issuance price of
$4.00 per share at pre-determined valuation measurement dates. The Harvard
Success Payments can be achieved over a maximum of 12 years from the effective
date of the agreement. See Note 5, License and collaboration agreements to our
unaudited condensed consolidated financial statements included elsewhere in this
report for more details on the various per share common stock values that
trigger a Harvard Success Payment.

We anticipate the first valuation measurement date to occur in February 2022,
the one-year anniversary of our IPO, with valuation dates occurring periodically
after this date. Additional valuation measurement dates are triggered by events
which include a merger, an asset sale, the sale of the majority of the shares
held by Series A convertible preferred stockholders, and the last day of the
term of the success payments. If a higher success payment tier is met at the
same time a lower tier is met, both tiers will be owed. Any previous success
payments made under the Harvard Agreement are credited against the success
payment owed as of any valuation measurement date so that Harvard does not
receive multiple success payments in connection with the same threshold.

As of September 30, 2021 and December 31, 2020, the estimated fair value of the
Harvard Success Payment liability was $22.6 million and $11.8 million,
respectively. As of September 30, 2021 and December 31, 2020, $5.0 million and
$0, respectively, were recorded in short-term liabilities, and $17.6 million and
$11.8 million, respectively, were recorded in long-term liabilities in the
condensed consolidated balance sheet. In connection with the change in the
estimated fair value of the Harvard Success Payment

                                       25

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liability, we recognized expenses of $3.4 million and $0.8 million for the three
months ended September 30, 2021 and 2020, respectively, and expenses of $10.8
million and $5.5 million for the nine months ended September 30, 2021 and 2020,
respectively.

See Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations "-Critical accounting policies and significant judgments and estimates-Success payments" in our 2020 Form 10-K for more information on the accounting treatment of the Harvard Success Payments.

Components of operating results

Operating expenses

Research and development



To date, research and development expenses have related primarily to discovery
and development of our platform technology and product candidates. Research and
development expenses are recognized as incurred and payments made prior to the
receipt of goods or services to be used in research and development are recorded
as prepaid expenses until the goods or services are received.

Research and development expenses consist of personnel-related costs, including
salaries, benefits, and non-cash stock-based compensation, external research and
development expenses incurred under arrangements with third parties, laboratory
supplies, costs to acquire and license technologies aligned with our goal of
translating engineered cells to medicines, facility and other allocated
expenses, including rent, depreciation, and allocated overhead costs, and other
research and development expenses. The timing and amount of costs to acquire and
license technologies in the future cannot be estimated with reliability and may
fluctuate from quarter to quarter and year to year.

We deploy our employee and infrastructure resources across multiple research and
development programs for developing our in vivo and ex vivo cell engineering
platforms, identifying and developing product candidates, and establishing
manufacturing capabilities. Due to our early stage of development, number of
ongoing projects, and our ability to use resources across several projects, the
vast majority of our research and development costs are not recorded on a
program-specific basis. These include costs for personnel, laboratory, and other
indirect facility and operating costs.

Research and development activities account for a significant portion of our
operating expenses. We anticipate that our research and development expenses
will increase over the foreseeable future as we expand our research and
development efforts including expanding the capabilities of our cell engineering
platforms, identifying product candidates, completing preclinical studies and
commencing clinical trials, establishing internal and external manufacturing
capabilities, seeking regulatory approval of our product candidates, and
incurring costs to acquire and license technologies aligned with our goal of
translating engineered cells to medicines. A change in the outcome of any of
these factors could result in a significant change in the costs and timing
associated with the development of our product candidates.

Research and development related success payments and contingent consideration



Research and development related success payments and contingent consideration
include the change in the estimated fair value of our Cobalt and Harvard Success
Payment liabilities and Cobalt Contingent Consideration. Research and
development expense (gain) related to our success payment liabilities and
contingent consideration is unpredictable and may vary significantly from
quarter to quarter and year to year due to changes in the assumptions used in
the calculations.

General and administrative

General and administrative expenses consist of personnel-related costs,
including salaries, benefits, and non-cash stock-based compensation for our
employees in finance, human resources, legal, information technology, executive,
and other administrative functions, legal and consulting fees, insurance fees,
and facility costs not otherwise included in research and development expenses.
Legal fees include those related to corporate and patent matters.

We anticipate that our general and administrative expenses will increase over
the foreseeable future to support our continued research and development
activities, grow our business, and support future possible business development
opportunities. We also anticipate continuing to incur expenses related to audit
and legal services associated with operating as a public company, maintaining
compliance with the rules and regulations of the Securities and Exchange
Commission (SEC) and standards applicable to companies listed on a national
securities exchange, investor relations activities, and other administrative and
professional services.

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Interest income, net

Interest income, net consists of interest earned on our cash, cash equivalents, and marketable securities.

Results of operations

Comparison of the three and nine months ended September 30, 2021 and 2020



The following table summarizes our results of operations for the periods
presented (in thousands):



                                        Three Months Ended
                                           September 30,                              Nine Months Ended September 30,
                                       2021             2020         Change             2021                   2020            Change
Operating expenses:
Research and development            $   53,245       $   40,056     $  13,189     $        140,121       $         96,453     $  43,668
Research and development related
success payments and contingent
consideration                           16,753            4,489        12,264               67,778                 57,309        10,469
General and administrative              13,433            7,099         6,334               37,731                 19,063        18,668
Total operating expenses                83,431           51,644        31,787              245,630                172,825        72,805
Loss from operations                   (83,431 )        (51,644 )     (31,787 )           (245,630 )             (172,825 )     (72,805 )
Interest income, net                       158              148            10                  409                    622          (213 )
Other income, net                           10               44           (34 )                 24                     68           (44 )
Net loss                            $  (83,263 )     $  (51,452 )   $ (31,811 )   $       (245,197 )     $       (172,135 )   $ (73,062 )

Research and development expenses

The following table summarizes the components of our research and development expenses for the periods presented:





                                                     Three Months Ended September 30,
                                                        2021                  2020            Change
                                                                     (in thousands)
Personnel                                          $        20,477       $        12,054     $  8,423
Research and laboratory                                     17,938                10,632        7,306
Facility and other allocated costs                          13,694                 8,019        5,675
Acquisition and licensing of technology                        213                 8,956       (8,743 )
Other                                                          923                   395          528
Total research and development expense             $        53,245       $        40,056     $ 13,189




Research and development expense was $53.2 million and $40.0 million for the
three months ended September 30, 2021 and 2020, respectively. The increase of
$13.2 million was primarily due to:

• increased personnel-related expenses of $8.4 million, including non-cash

stock-based compensation of $3.1 million, which was primarily attributable


        to an increase in headcount to expand our research and development
        capabilities;

• an increase of $7.3 million in research and laboratory costs, including

laboratory supplies, preclinical studies, third-party manufacturing costs,

and other external research expenses; and

• an increase of $5.2 million of facility and allocated costs, including

rent, depreciation, and allocated overhead costs.

The increases were offset by a decrease in upfront license fees of $8.7 million, primarily due to the upfront expense of $8.5 million recorded in the three months ended September 30, 2020 related to the acquisition of Oscine Corp.


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The following table summarizes the components of our research and development expenses for the periods presented:





                                                   Nine Months Ended September 30,
                                                      2021               2020           Change
                                                                  (in thousands)
Personnel                                          $   55,230       $       33,288     $ 21,942
Research and laboratory                                46,036               28,453       17,583
Facility and other allocated costs                     34,800               21,519       13,281
Acquisition and licensing of technology                 1,845               11,352       (9,507 )
Other                                                   2,210                1,841          369
Total research and development expense             $  140,121       $       

96,453 $ 43,668




Research and development expense was $140.1 million and $96.4 million for the
nine months ended September 30, 2021 and 2020, respectively. The increase of
$43.7 million was primarily due to:

• increased personnel-related expenses of $21.9 million, including non-cash

stock-based compensation of $7.3 million, which was primarily attributable


        to an increase in headcount to expand our research and development
        capabilities;

• an increase of $17.6 million in research and laboratory costs, including

preclinical studies, laboratory supplies, third-party manufacturing costs,

and other external research expenses; and

• an increase of $12.4 million of facility and allocated costs, including

rent, depreciation, and allocated overhead costs.




The increases were offset by a decrease in upfront license fees of $9.5 million,
primarily due to the upfront expense of $8.5 million recorded in the nine months
ended September 30, 2020 related to the acquisition of Oscine Corp.

Research and development related success payments and contingent consideration



The following table summarizes the expenses (gains) associated with research and
development related success payments and contingent consideration for the
periods presented:



                                                    Three Months Ended September 30,
                                                      2021                  2020            Change
                                                                    (in thousands)
Success payments                                   $    25,229         $         2,156     $  23,073
Contingent consideration                                (8,476 )                 2,333       (10,809 )
Total research and development related success
payments and contingent consideration              $    16,753         $    

4,489 $ 12,264




For the three months ended September 30, 2021 and 2020, we recognized net
non-cash expenses of $16.8 million and $4.5 million, respectively, for the
changes in the estimated fair value of research and development related success
payments and contingent consideration. The expense related to the change in the
estimated fair value of our Cobalt Success Payment and Harvard Success Payment
liabilities in aggregate was $25.2 million for the three months ended September
30, 2021 compared to $2.2 million for the same period in 2020. The change in the
estimated fair value of the success payment liabilities was due to increases in
our market capitalization and common stock price during the relative periods. We
recorded a gain in the three months ended September 30, 2021 of $8.5 million for
the change in the estimated fair value of our Cobalt Contingent Consideration
and an expense of $2.3 million for the same period in 2020. The change in the
estimated fair value of the Cobalt Contingent Consideration was primarily due to
an increase in the discount rate used in the calculation and scientific progress
toward the achievement of milestones during the relative periods.



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The following table summarizes the expenses associated with research and
development related success payments and contingent consideration for the for
the periods presented:



                                                      Nine Months Ended September 30,
                                                        2021                  2020            Change
                                                                     (in thousands)
Success payments                                   $        57,698       $        40,637     $ 17,061
Contingent consideration                                    10,080                16,672       (6,592 )
Total research and development related success
payments and contingent consideration              $        67,778       $  

57,309 $ 10,469




For the nine months ended September 30, 2021 and 2020, we recognized non-cash
expenses of $67.8 million and $57.3 million, respectively, for the changes in
the estimated fair value of research and development related success payments
and contingent consideration. The expense related to the change in the estimated
fair value of our Cobalt Success Payment and Harvard Success Payment liabilities
in aggregate was $57.7 million for the nine months ended September 30, 2021
compared to $40.6 million for the same period in 2020. The change in the
estimated fair value of the success payment liabilities was due to increases in
our market capitalization and common stock price during the relative periods.
The expense related to the change in the estimated fair value of our Cobalt
Contingent Consideration was $10.1 million for the nine months ended September
30, 2021 compared to $16.7 million for the same period in 2020. The change in
the estimated fair value of the Cobalt Contingent Consideration was primarily
due to scientific progress toward the achievement of milestones during the
relative periods.

General and administrative Expenses



General and administrative expenses were $13.4 million and $37.7 million for the
three and nine months ended September 30, 2021, respectively, compared to $7.1
million and $19.1 million for the three and nine months ended September 30,
2020, respectively.

The increase of $6.3 million for the three months ended September 30, 2021 was
primarily due to increased personnel-related expenses of $3.5 million, including
non-cash stock-based compensation of $1.7 million, primarily attributable to an
increase in headcount to build our infrastructure, increased legal fees to
support our patent portfolio and licensing arrangements of $1.3 million, and
increased insurance of $1.0 million associated with being a public company.

The increase of $18.6 million for the nine months ended September 30, 2021 was
primarily due to increased personnel-related expenses of $8.7 million, including
non-cash stock-based compensation of $4.7 million, primarily attributable to an
increase in headcount to build our infrastructure, increased legal fees to
support our patent portfolio and licensing arrangements of $3.7 million,
increased insurance of $3.0 million associated with being a public company,
increased consulting fees of $1.0 million, and facility costs, including rent,
of $0.9 million.

Interest income, net

Interest income, net was $0.2 million and $0.4 million for the three and nine
months ended September 30, 2021, respectively, compared to $0.2 million and $0.6
million for the three and nine months ended September 30, 2020, respectively.

Liquidity, capital resources, and capital requirements

Sources of liquidity



As of September 30, 2021, we had $866.1 million in cash, cash equivalents, and
marketable securities. To date we have raised an aggregate of approximately $1.3
billion in net proceeds through our IPO and private placements of our
convertible preferred stock. Since our inception, we have not generated any
revenue from product sales or any other sources, and we have incurred
significant operating losses. We have not yet commercialized any products, and
we do not expect to generate revenue from sales of any product candidates for a
number of years, if ever.

Future funding requirements



We expect to incur additional losses in the foreseeable future as we conduct and
expand our research and development efforts, including conducting preclinical
studies and clinical trials, developing new product candidates, establishing
internal and external manufacturing capabilities, and funding our operations
generally.

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Based on our current operating plan, we believe that our existing cash, cash
equivalents, and marketable securities will be sufficient to meet our working
capital and capital expenditure needs for approximately the next 36 months.
However, we anticipate that we will need to raise additional financing in the
future to fund our operations, including the commercialization of any approved
product candidates. We are subject to the risks typically related to the
development of new products, and we may encounter unforeseen expenses,
difficulties, complications, delays, and other unknown factors that may
adversely affect our business.

Our future capital requirements will depend on many factors, including:

• the scope, timing, progress, costs, and results of discovery, preclinical


        development, and clinical trials for our current and future product
        candidates;

• the number of clinical trials required for regulatory approval of our

current and future product candidates;

• the costs, timing, and outcome of regulatory review of any of our current

and future product candidates;

• the cost associated with building our manufacturing capabilities, as well

as costs associated with the manufacturing of clinical and commercial

supplies of our current and future product candidates;

• the costs and timing of future commercialization activities, including

manufacturing, marketing, sales, and distribution, for any of our product


        candidates for which we receive marketing approval;


    •   the costs and timing of preparing, filing, and prosecuting patent

applications, maintaining and enforcing our intellectual property rights,

and defending any intellectual property-related claims, including any

claims by third parties that we are infringing upon their intellectual


        property rights;


    •   our ability to maintain existing, and establish new, strategic

collaborations, licensing, or other arrangements and the financial terms

of any such agreements, including the timing and amount of any future

milestone, royalty, or other payments due under any such agreement;

• the revenue, if any, received from commercial sales of our product


        candidates for which we receive marketing approval;


  • expenses to attract, hire, and retain skilled personnel;


  • the costs of operating as a public company;

• our ability to establish a commercially viable pricing structure and

obtain approval for coverage and adequate reimbursement from third-party

and government payers;

• our ability to address any potential interruptions or delays resulting


        from factors related to the COVID-19 pandemic;


  • the effect of competing technological and market developments; and

• the extent to which we acquire or invest in businesses, products, and

technologies.




Until such time as we can generate significant revenue from product sales, if
ever, we expect to finance our operations from the sale of additional equity or
debt financings, or other capital obtained in connection with strategic
collaborations or licensing or other arrangements. In the event that additional
financing is required, we may not be able to raise it on terms that are
acceptable to us or at all. If we raise additional funds through the issuance of
equity or convertible debt securities, it may result in dilution to our existing
stockholders. Debt financing, if available, may result in increased fixed
payment obligations, and the existence of securities with rights that may be
senior to those of our common stock. If we incur indebtedness, we could become
subject to covenants that would restrict our operations. If we raise funds
through strategic collaborations or licensing or other arrangements, we may
relinquish significant rights or grant licenses on terms that are not favorable
to us. Our ability to raise additional funds may be adversely impacted by
potential worsening global economic conditions and the recent disruptions to,
and volatility in, the credit and financial markets in the United States and
worldwide resulting from the ongoing COVID-19 pandemic and otherwise. If we are
unable to raise additional capital when desired, our business, results of
operations, and financial condition would be adversely affected.

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Cash flows

The following table summarizes our cash flows for the periods indicated:





                                                            Nine Months Ended September 30,
                                                              2021                   2020
                                                                    (in thousands)
Net cash provided by (used in):
Operating activities                                    $       (140,955 )     $       (100,423 )
Investing activities                                            (172,137 )             (265,604 )
Financing activities                                             628,632                435,584
Net increase in cash, cash equivalents, and
restricted cash                                         $        315,540       $         69,557




Operating activities

During the nine months ended September 30, 2021, net cash used in operating
activities was $141.0 million, consisting primarily of our net loss of $245.2
million, partially offset by the change in our net operating assets and
liabilities of $11.3 million and non-cash charges of $92.9 million. The non-cash
charges of $92.9 million consisted of $57.7 million for revaluation of our
success payment liabilities, $10.1 million for revaluation of contingent
consideration, non-cash stock-based compensation expense of $15.0 million,
depreciation expense of $7.7 million, and other non-cash charges of $2.4
million.

During the nine months ended September 30, 2020, net cash used in operating
activities was $100.4 million, consisting of our net loss of $172.1 million,
partially offset by non-cash charges of $68.2 million and the change in our net
operating assets and liabilities of $3.5 million. The non-cash charges of $68.2
million consisted of $40.6 million for revaluation of success payment
liabilities, $16.7 million for revaluation of contingent consideration,
depreciation expense of $4.2 million, non-cash stock-based compensation expense
of $3.0 million, and other non-cash charges of $3.7 million.

Investing activities



During the nine months ended September 30, 2021, cash used in investing
activities was $172.1 million. This consisted primarily of sales and maturities,
less purchases, of marketable securities of $147.4 million and purchases of
property and equipment of $24.7 million. During the nine months ended September
30, 2020, cash used in investing activities was $265.6 million, consisting
primarily of net purchases, sales, and maturities of marketable securities of
$251.0 million and purchases of property and equipment of $14.6 million.

Financing activities



During the nine months ended September 30, 2021, cash provided by financing
activities was $628.6 million, consisting primarily of net proceeds from our IPO
of $626.4 million. During the nine months ended September 30, 2020, cash
provided by financing activities was $435.6 million, consisting primarily of
proceeds from the sale of our convertible preferred stock.

Contractual obligations and commitments

The following table summarizes our significant contractual obligations and commitments as of September 30, 2021:





                                                      Payments Due by Period
                                                                                  More than 5
                     Less than 1 Year       1 to 3 Years       3 to 5 Years          Years            Total
                                                          (in thousands)
Operating lease
obligations         $           16,033     $       34,850     $      

34,568     $      85,405     $   170,856




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Other than as disclosed in the table above, the payment obligations under our
license, collaboration, and acquisition agreements as of September 30, 2021 are
contingent upon future events such as our achievement of pre-specified
development, regulatory, and commercial milestones or royalties on net product
sales. See the section titled "Business-Key Intellectual Property Agreements" in
Part I, Item 1 of our 2020 Form 10-K for more information about these payment
obligations. We are also obligated to make a success payment to Cobalt of up to
$500.0 million, payable in cash or stock at our discretion, pursuant to the
terms and conditions in the Cobalt acquisition agreement, and success payments
to Harvard up to an aggregate of $175.0 million, payable in cash. See Part II,
Item 7. Management's Discussion and Analysis of Financial Condition and Results
of Operations "-Critical accounting policies and significant judgments and
estimates-Success payments" in our 2020 Form 10-K for more information on the
success payments. As of September 30, 2021, the timing and likelihood of
achieving the milestones and success payments and generating future product
sales are uncertain and, therefore, any related payments are not included in the
table above.

We also enter into agreements in the normal course of business for sponsored
research, preclinical studies, contract manufacturing, and other services and
products for operating purposes, which are generally cancelable upon written
notice. These obligations and commitments are not included in the table above.

Off-balance sheet arrangements

Since our inception, we have not engaged in any off-balance sheet arrangements as defined under the rules and regulations of the SEC.

JOBS Act accounting election



We are an "emerging growth company," as defined in the Jumpstart Our Business
Startups Act of 2012 (the JOBS Act). We will cease to be an emerging growth
company until the earliest of (1) December 31, 2026, (2) the last day of the
fiscal year in which we have total annual gross revenue of at least $1.07
billion, (3) the last day of the fiscal year in which we are deemed to be a
"large accelerated filer" as defined in Rule 12b-2 under the Exchange Act, which
would occur if the fair market value of our common stock held by non-affiliates
exceeded $700.0 million as of the last business day of the second fiscal quarter
of such year, or (4) the date on which we have issued more than $1.0 billion in
non-convertible debt securities during the prior three-year period. For so long
as we remain an emerging growth company, we are permitted and intend to rely on
certain exemptions from various public company reporting requirements, including
not being required to have our internal control over financial reporting by our
independent registered public accounting firm pursuant to Section 404 of the
Sarbanes-Oxley Act, reduced disclosure obligations regarding executive
compensation in our periodic reports and proxy statements, and exemptions from
the requirements of holding a nonbinding advisory vote on executive compensation
and any golden parachute payments not previously approved. In addition, 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. We have elected to use
the extended transition period for any new or revised accounting standards
during the period in which we remain an emerging growth company; however, we may
adopt certain new or revised accounting standards early if the standard allows
early adoption.

Critical accounting policies and significant judgements and estimates



Our condensed consolidated financial statements are prepared in accordance with
generally accepted accounting principles in the United States. The preparation
of these financial statements requires us to make estimates and assumptions that
affect the amounts reported in the condensed consolidated financial statements
and accompanying notes. 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. The critical accounting policies used in preparation
of these condensed consolidated financial statements as of September 30, 2021
and for the three and nine months ended September 30, 2021 and 2020 are
consistent with those discussed in Part II, Item 7. Management's Discussion and
Analysis of Financial Condition and Results of Operations "-Critical accounting
policies and significant judgments and estimates" in our 2020 Form 10-K.

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