Document:

EX-10.44

 Exhibit 10.44 

THE SECURITIES WHICH ARE THE SUBJECT OF THIS AGREEMENT HAVE NOT BEEN QUALIFIED WITH THE COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE
ISSUANCE OF SUCH SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR PRIOR TO SUCH QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT FROM QUALIFICATION BY SECTION 25100, 25102, OR 25105 OF THE
CALIFORNIA CORPORATIONS CODE. THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE EXPRESSLY CONDITIONED UPON SUCH QUALIFICATION BEING OBTAINED, UNLESS THE SALE IS SO EXEMPT. 

THE SECURITIES WHICH ARE THE SUBJECT OF THIS AGREEMENT HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR
DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF
1933. 
 HISTOGEN INC. 

STOCK OPTION AGREEMENT 

Histogen Inc. has granted to the Participant named in the Notice of Grant of Stock Option (the “Grant Notice”) to
which this Stock Option Agreement (the “Option Agreement”) is attached an option (the “Option”) to purchase shares of Stock upon the terms and conditions set forth in the Grant Notice and this Option
Agreement. The Option has been granted pursuant to and shall in all respects be subject to the terms and conditions of the Histogen Inc. 2017 Stock Plan (the “Plan”), as amended to the Date of Grant, the provisions of which
are incorporated herein by reference. By signing the Grant Notice, the Participant: (a) acknowledges receipt of, and represents that the Participant has read and is familiar with, the Grant Notice, this Option Agreement and the Plan,
(b) accepts the Option subject to all of the terms and conditions of the Grant Notice, this Option Agreement and the Plan, and (c) agrees to accept as binding, conclusive and final all decisions or interpretations of the Board upon any
questions arising under the Grant Notice, this Option Agreement or the Plan. 
  

	 	1.	 DEFINITIONS AND CONSTRUCTION.

 1.1 Definitions. Unless otherwise defined herein, capitalized terms shall have the meanings assigned to such
terms in the Grant Notice or the Plan. 
 1.2 Construction. Captions and titles contained herein are for convenience only and shall
not affect the meaning or interpretation of any provision of this Option Agreement. Except when otherwise indicated by the context, the singular shall include the plural and the plural shall include the singular. Use of the term “or” is
not intended to be exclusive, unless the context clearly requires otherwise. 
  

	 	2.	 TAX CONSEQUENCES. 

2.1 Tax Status of Option. This Option is intended to have the tax status designated in the Grant Notice. 

 (a) Incentive Stock Option. If the Grant Notice so designates, this Option is
intended to be an Incentive Stock Option within the meaning of Section 422(b) of the Code, but the Company does not represent or warrant that this Option qualifies as such. The Participant should consult with the Participant’s own tax
advisor regarding the tax effects of this Option and the requirements necessary to obtain favorable income tax treatment under Section 422 of the Code, including, but not limited to, holding period requirements. (NOTE TO PARTICIPANT: If the
Option is exercised more than three (3) months after the date on which you cease to be an Employee (other than by reason of your death or permanent and total disability as defined in Section 22(e)(3) of the Code), the Option will be
treated as a Nonstatutory Stock Option and not as an Incentive Stock Option to the extent required by Section 422 of the Code.) 
 (b)
Nonstatutory Stock Option. If the Grant Notice so designates, this Option is intended to be a Nonstatutory Stock Option and shall not be treated as an Incentive Stock Option within the meaning of Section 422(b) of the Code. 

2.2 ISO Fair Market Value Limitation. If the Grant Notice designates this Option as an Incentive Stock Option, then to the extent that
the Option (together with all Incentive Stock Options granted to the Participant under all stock option plans of the Participating Company Group, including the Plan) becomes exercisable for the first time during any calendar year for shares having a
Fair Market Value greater than One Hundred Thousand Dollars ($100,000), the portion of such options which exceeds such amount will be treated as Nonstatutory Stock Options. For purposes of this Section, options designated as Incentive Stock Options
are taken into account in the order in which they were granted, and the Fair Market Value of stock is determined as of the time the option with respect to such stock is granted. If the Code is amended to provide for a different limitation from that
set forth in this Section, such different limitation shall be deemed incorporated herein effective as of the date required or permitted by such amendment to the Code. If the Option is treated as an Incentive Stock Option in part and as a
Nonstatutory Stock Option in part by reason of the limitation set forth in this Section, the Participant may designate which portion of such Option the Participant is exercising. In the absence of such designation, the Participant shall be deemed to
have exercised the Incentive Stock Option portion of the Option first. Separate certificates representing each such portion shall be issued upon the exercise of the Option. (NOTE TO PARTICIPANT: If the aggregate Exercise Price of the Option (that
is, the Exercise Price multiplied by the Number of Option Shares) plus the aggregate exercise price of any other Incentive Stock Options you hold (whether granted pursuant to the Plan or any other stock option plan of the Participating Company
Group) is greater than $100,000, you should contact the Chief Financial Officer of the Company to ascertain whether the entire Option qualifies as an Incentive Stock Option.) 
  

	 	3.	 ADMINISTRATION. 

All questions of interpretation concerning the Grant Notice, this Option Agreement, the Plan or any other form of agreement or other document
employed by the Company in the administration of the Plan or the Option shall be determined by the Board. All such determinations by the Board shall be final, binding and conclusive upon all persons having an interest in the Option, unless
fraudulent or made in bad faith. Any and all actions, decisions and determinations taken or made by the Board in the exercise of its discretion pursuant to the Plan or the Option or other agreement thereunder (other than determining questions of
interpretation pursuant to the 

  
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preceding sentence) shall be final, binding and conclusive upon all persons having an interest in the Option. Any Officer shall have the authority to act on behalf of the Company with respect to
any matter, right, obligation, or election which is the responsibility of or which is allocated to the Company herein, provided the Officer has apparent authority with respect to such matter, right, obligation, or election. 

 

	 	4.	 EXERCISE OF THE OPTION.

 4.1 Right to Exercise. Except as otherwise provided herein, the Option shall be exercisable on and after the
Initial Vesting Date and prior to the termination of the Option (as provided in Section 6) in an amount not to exceed the number of Vested Shares less the number of shares previously acquired upon exercise of the Option, subject to the
Company’s repurchase rights set forth in Section 12. In no event shall the Option be exercisable for more shares than the Number of Option Shares, as adjusted pursuant to Section 9. 

4.2 Method of Exercise. Exercise of the Option shall be by means of electronic or written notice (the “Exercise
Notice”) in a form authorized by the Company. An electronic Exercise Notice must be digitally signed or authenticated by the Participant in such manner as required by the notice and transmitted to the Company or an authorized
representative of the Company (including a third-party administrator designated by the Company). In the event that the Participant is not authorized or is unable to provide an electronic Exercise Notice, the Option shall be exercised by a written
Exercise Notice addressed to the Company, signed by the Participant and delivered in person, by certified or registered mail, return receipt requested, by confirmed facsimile transmission, or by such other means as the Company may permit, to the
Company, or an authorized representative of the Company (including a third-party administrator designated by the Company). Each Exercise Notice, whether electronic or written, must state the Participant’s election to exercise the Option, the
number of whole shares of Stock for which the Option is being exercised and such other representations and agreements as to the Participant’s investment intent with respect to such shares as may be required pursuant to the provisions of this
Option Agreement. Further, each Exercise Notice must be received by the Company prior to the termination of the Option as set forth in Section 6 and must be accompanied by full payment of the aggregate Exercise Price for the number of shares of
Stock being purchased. The Option shall be deemed to be exercised upon receipt by the Company of such electronic or written Exercise Notice and the aggregate Exercise Price. 

4.3 Payment of Exercise Price. 

(a) Forms of Consideration Authorized. Except as otherwise provided below, payment of the aggregate Exercise Price for the
number of shares of Stock for which the Option is being exercised shall be made (i) in cash, by check or in cash equivalent, (ii) if permitted by the Company and subject to the limitations contained in Section 4.3(b), by means of
(1) a Stock Tender Exercise, (2) a Cashless Exercise, (3) a Net-Exercise, or (4) a promissory note subject to such terms and conditions as the Company may prescribe; or (iii) by any
combination of the foregoing. 

  
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 (b) Limitations on Forms of Consideration. The Company reserves, at any and
all times, the right, in the Company’s sole and absolute discretion, to establish, decline to approve or terminate any program or procedure providing for payment of the Exercise Price through any of the means described below, including with
respect to the Participant notwithstanding that such program or procedures may be available to others. 
 (i) Stock Tender Exercise.
A “Stock Tender Exercise” means the delivery of a properly executed Exercise Notice accompanied by (1) the Participant’s tender to the Company, or attestation to the ownership, in a form acceptable to the Company of
whole shares of Stock having a Fair Market Value that does not exceed the aggregate Exercise Price for the shares with respect to which the Option is exercised, and (2) the Participant’s payment to the Company in cash of the remaining
balance of such aggregate Exercise Price not satisfied by such shares’ Fair Market Value. A Stock Tender Exercise shall not be permitted if it would constitute a violation of the provisions of any law, regulation or agreement restricting the
redemption of the Company’s stock. If required by the Company, the Option may not be exercised by tender to the Company, or attestation to the ownership, of shares of Stock unless such shares either have been owned by the Participant for a
period of time required by the Company (and not used for another option exercise by attestation during such period) or were not acquired, directly or indirectly, from the Company. 

(ii) Cashless Exercise. A Cashless Exercise shall be permitted only upon the class of shares subject to the Option becoming publicly
traded in an established securities market. A “Cashless Exercise” means the delivery of a properly executed Exercise Notice together with irrevocable instructions to a broker in a form acceptable to the Company providing for
the assignment to the Company of the proceeds of a sale or loan with respect to shares of Stock acquired upon the exercise of the Option in an amount not less than the aggregate Exercise Price for such shares (including, without limitation, through
an exercise complying with the provisions of Regulation T as promulgated from time to time by the Board of Governors of the Federal Reserve System). 

(iii) Net-Exercise. A
“Net-Exercise” means the delivery of a properly executed Exercise Notice electing a procedure pursuant to which (1) the Company will reduce the number of shares otherwise issuable
to the Participant upon the exercise of the Option by the largest whole number of shares having a Fair Market Value that does not exceed the aggregate Exercise Price for the shares with respect to which the Option is exercised, and (2) the
Participant shall pay to the Company in cash the remaining balance of such aggregate Exercise Price not satisfied by such reduction in the number of whole shares to be issued. Following a Net-Exercise, the
number of shares remaining subject to the Option, if any, shall be reduced by the sum of (1) the net number of shares issued to the Participant upon such exercise, and (2) the number of shares deducted by the Company for payment of the
aggregate Exercise Price. 
 4.4 Tax Withholding. 

(a) In General. At the time the Option is exercised, in whole or in part, or at any time thereafter as requested by a
Participating Company, the Participant hereby authorizes withholding from payroll and any other amounts payable to the Participant, and otherwise agrees to make adequate provision for any sums required to satisfy the federal, state, local and
foreign tax (including social insurance) withholding obligations of the Participating Company Group, if any, which arise in connection with the Option. The Company shall have no obligation to deliver shares of Stock until the tax withholding
obligations of the Participating Company Group have been satisfied by the Participant. 

  
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 (b) Withholding in or Directed Sale of Shares. The Company shall have the
right, but not the obligation, to require the Participant to satisfy all or any portion of a Participating Company’s tax withholding obligations upon exercise of the Option by deducting from the shares of Stock otherwise issuable to the
Participant upon such exercise a number of whole shares having a fair market value, as determined by the Company as of the date of exercise, not in excess of the amount of such tax withholding obligations determined by the applicable minimum
statutory withholding rates. The Company may require the Participant to direct a broker, upon the exercise of the Option, to sell a portion of the shares subject to the Option determined by the Company in its discretion to be sufficient to cover the
tax withholding obligations of any Participating Company and to remit an amount equal to such tax withholding obligations to the Company in cash. 

4.5 Beneficial Ownership of Shares; Certificate Registration. The Participant hereby authorizes the Company, in its sole discretion, to
deposit for the benefit of the Participant with any broker with which the Participant has an account relationship of which the Company has notice any or all shares acquired by the Participant pursuant to the exercise of the Option. Except as
provided by the preceding sentence, a certificate for the shares as to which the Option is exercised shall be registered in the name of the Participant, or, if applicable, in the names of the heirs of the Participant. 

4.6 Restrictions on Grant of the Option and Issuance of Shares. The grant of the Option and the issuance of shares of Stock upon
exercise of the Option shall be subject to compliance with all applicable requirements of federal, state or foreign law with respect to such securities. The Option may not be exercised if the issuance of shares of Stock upon exercise would
constitute a violation of any applicable federal, state or foreign securities laws or other law or regulations or the requirements of any stock exchange or market system upon which the Stock may then be listed. In addition, the Option may not be
exercised unless (i) a registration statement under the Securities Act shall at the time of exercise of the Option be in effect with respect to the shares issuable upon exercise of the Option or (ii) in the opinion of legal counsel to the
Company, the shares issuable upon exercise of the Option may be issued in accordance with the terms of an applicable exemption from the registration requirements of the Securities Act. THE PARTICIPANT IS CAUTIONED THAT THE OPTION MAY NOT BE
EXERCISED UNLESS THE FOREGOING CONDITIONS ARE SATISFIED. ACCORDINGLY, THE PARTICIPANT MAY NOT BE ABLE TO EXERCISE THE OPTION WHEN DESIRED EVEN THOUGH THE OPTION IS VESTED. The inability of the Company to obtain from any regulatory body having
jurisdiction the authority, if any, deemed by the Company’s legal counsel to be necessary to the lawful issuance and sale of any shares subject to the Option shall relieve the Company of any liability in respect of the failure to issue or sell
such shares as to which such requisite authority shall not have been obtained. As a condition to the exercise of the Option, the Company may require the Participant to satisfy any qualifications that may be necessary or appropriate, to evidence
compliance with any applicable law or regulation and to make any representation or warranty with respect thereto as may be requested by the Company. 

  
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 4.7 Stockholders Agreement. The Participant (and, if applicable, his or her heirs)
shall be required, at the time of exercising an Option and as a condition to such exercise, to sign and deliver an adoption agreement or counterpart signature page to, and be bound by, each Stockholders Agreement then in effect and any other
agreement that the Company requires a holder of common stock of the Company to sign (to the extent such agreements exist and such Participant is not already a party to such agreements), in form and substance satisfactory to the Company. Each
Participant (and, if applicable, his or her heirs) acknowledges that a Stockholders Agreement or any such other agreement may restrict transfers of common stock of the Company. This obligation set forth in this provision shall remain in effect with
respect to any Stockholder Agreement until such Stockholder Agreement is terminated. In addition, to the extent any such Stockholder Agreement is amended, modified or otherwise replaced by a similar agreement, the obligation set forth herein shall
also apply to the modified, amended and/or replacement agreement. 
 4.8 Fractional Shares. The Company shall not be required to issue
fractional shares upon the exercise of the Option. 
  

	 	5.	 NONTRANSFERABILITY OF THE
OPTION. 

 During the lifetime of the Participant, the Option shall be exercisable
only by the Participant or the Participant’s guardian or legal representative. The Option shall not be subject in any manner to anticipation, alienation, sale, exchange, transfer, assignment, pledge, encumbrance, or garnishment by creditors of
the Participant or the Participant’s beneficiary, except transfer by will or by the laws of descent and distribution. Following the death of the Participant, the Option, to the extent provided in Section 7, may be exercised by the
Participant’s legal representative or by any person empowered to do so under the deceased Participant’s will or under the then applicable laws of descent and distribution. Notwithstanding the foregoing, for so long as the Company is
relying on the exemption provided by Rule 12h-1(f) under the Exchange Act, the Option and, prior to its exercise, the shares to be issued upon the exercise of the Option, shall not be transferred except in
compliance with the restrictions on transfer under Rule 12h-1(f) (including the requirement under such rule that any permitted transferee may not further transfer the Option) or be made subject to any short
position, “put equivalent position” or “call equivalent position” by the Participant, as such terms are defined in Rule 16a-1 of the Exchange Act. 

 

	 	6.	 TERMINATION OF THE OPTION.

 The Option shall terminate and may no longer be exercised after the first to occur of (a) the close of business
on the Option Expiration Date, (b) the close of business on the last date for exercising the Option following termination of the Participant’s Service as described in Section 7, or (c) a Change in Control to the extent provided
in Section 8. 
  

	 	7.	 EFFECT OF TERMINATION OF
SERVICE. 

 7.1 Option Exercisability. The Option shall terminate immediately
upon the Participant’s termination of Service to the extent that it is then unvested and shall be exercisable after the Participant’s termination of Service to the extent it is then vested only during the applicable time period as
determined below and thereafter shall terminate. 

  
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 (a) Disability. If the Participant’s Service terminates because of the
Disability of the Participant, the Option, to the extent unexercised and exercisable for Vested Shares on the date on which the Participant’s Service terminated, may be exercised by the Participant (or the Participant’s guardian or legal
representative) at any time prior to the expiration of twelve (12) months after the date on which the Participant’s Service terminated, but in any event no later than the Option Expiration Date. 

(b) Death. If the Participant’s Service terminates because of the death of the Participant, the Option, to the extent
unexercised and exercisable for Vested Shares on the date on which the Participant’s Service terminated, may be exercised by the Participant’s legal representative or other person who acquired the right to exercise the Option by reason of
the Participant’s death at any time prior to the expiration of twelve (12) months after the date on which the Participant’s Service terminated, but in any event no later than the Option Expiration Date. The Participant’s Service
shall be deemed to have terminated on account of death if the Participant dies within three (3) months after the Participant’s termination of Service. 

(c) Termination for Cause. Notwithstanding any other provision of this Option Agreement, if the Participant’s Service is
terminated for Cause, the Option shall terminate in its entirety and cease to be exercisable immediately upon such termination of Service. 

(d) Other Termination of Service. If the Participant’s Service terminates for any reason, except Disability, death or
Cause, the Option, to the extent unexercised and exercisable for Vested Shares by the Participant on the date on which the Participant’s Service terminated, may be exercised by the Participant at any time prior to the expiration of three
(3) months after the date on which the Participant’s Service terminated, but in any event no later than the Option Expiration Date. 

7.2 Extension if Exercise Prevented by Law. Notwithstanding the foregoing other than termination of the Participant’s Service for
Cause, if the exercise of the Option within the applicable time periods set forth in Section 7.1 is prevented by the provisions of Section 4.6, the Option shall remain exercisable until the later of (a) thirty (30) days after the
date such exercise first would no longer be prevented by such provisions or (b) the end of the applicable time period under Section 7.1, but in any event no later than the Option Expiration Date. 

 

	 	8.	 EFFECT OF CHANGE IN
CONTROL. 

 In the event of a Change in Control, except to the extent that the Board
determines to settle the Option in accordance with Section 9.1(c) of the Plan, the surviving, continuing, successor, or purchasing corporation or other business entity or parent thereof, as the case may be (the
“Acquiror”), may, without the consent of the Participant, assume or continue in full force and effect the Company’s rights and obligations under all or any portion of the Option or substitute for all or any portion of
the Option a substantially equivalent option for the Acquiror’s stock. For purposes of this Section, the Option or any portion thereof shall be deemed assumed if, following the Change in Control, the Option confers the right to receive, subject
to the terms and conditions of the Plan and this Option Agreement, for each share of Stock subject to such portion of the Option immediately prior to the Change in Control, the consideration (whether stock, cash, other securities or property or a
combination thereof) to which a holder of a share of Stock on the 

  
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effective date of the Change in Control was entitled (and if holders were offered a choice of consideration, the type of consideration chosen by the holders of a majority of the outstanding
shares of Stock); provided, however, that if such consideration is not solely common stock of the Acquiror, the Board may, with the consent of the Acquiror, provide for the consideration to be received upon the exercise of the Option for each share
of Stock to consist solely of common stock of the Acquiror equal in Fair Market Value to the per share consideration received by holders of Stock pursuant to the Change in Control. If any portion of such consideration may be received by holders of
Stock pursuant to the Change in Control on a contingent or delayed basis, the Board may, in its discretion, determine such Fair Market Value per share as of the time of the Change in Control on the basis of the Board’s good faith estimate of
the present value of the probable future payment of such consideration. In the event that the Acquiror fails to assume or substitute for this Option in connection with a Change in Control, and if the Participant has at least two full years of
continuous Service as of the effective date of the Change in Control, the Participant shall be fully and immediately vested in one hundred percent (100%) of the shares subject to this Option effective immediately prior to the consummation of the
Change in Control, so long as the Participant’s Service has not terminated prior to the effective date of the Change in Control. In the event that the Acquiror fails to assume or substitute for this Option in connection with a Change in
Control, and if the Participant has less than two full years of continuous Service as of the effective date of the Change in Control, the Participant shall be vested in fifty percent (50%) of the shares subject to this Option that were not otherwise
vested immediately prior to the consummation of the Change in Control, which vesting shall occur effective immediately prior to the consummation of the Change in Control, so long as the Participant’s Service has not terminated prior to the
effective date of the Change in Control. In the event that the Acquiror assumes or substitutes for this Option in connection with a Change in Control, the Change in Control shall not change or affect the vested status of the shares subject to this
Option. The exercise or vesting of any Option and any shares acquired upon the exercise thereof that was permissible solely by reason of this Section shall be conditioned upon the consummation of the Change in Control. The Option shall terminate and
cease to be outstanding effective as of the time of consummation of the Change in Control to the extent that the Option is neither assumed or continued by the Acquiror in connection with the Change in Control nor exercised as of the time of the
Change in Control. Notwithstanding the foregoing, shares acquired upon exercise of the Option prior to the Change in Control and any consideration received pursuant to the Change in Control with respect to such shares shall continue to be subject to
all applicable provisions of this Option Agreement except as otherwise provided herein. 
  

	 	9.	 ADJUSTMENTS FOR CHANGES IN
CAPITAL STRUCTURE. 

 Subject to any required action by the
stockholders of the Company and the requirements of Sections 409A and 424 of the Code to the extent applicable, in the event of any change in the Stock effected without receipt of consideration by the Company, whether through merger, consolidation,
reorganization, reincorporation, recapitalization, reclassification, stock dividend, stock split, reverse stock split, split-up, split-off, spin-off, combination of shares, exchange of shares, or similar change in the capital structure of the Company, or in the event of payment of a dividend or distribution to the stockholders of the Company in a form
other than Stock (excepting normal cash dividends) that has a material effect on the Fair Market Value of shares of Stock, appropriate and proportionate adjustments shall be made in the number, Exercise Price and kind of shares subject to the
Option, in order to prevent dilution or enlargement of the Participant’s 

  
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rights under the Option. For purposes of the foregoing, conversion of any convertible securities of the Company shall not be treated as “effected without receipt of consideration by the
Company.” Any fractional share resulting from an adjustment pursuant to this Section shall be rounded down to the nearest whole number, and the Exercise Price shall be rounded up to the nearest whole cent. In no event may the Exercise Price be
decreased to an amount less than the par value, if any, of the stock subject to the Option. Such adjustments shall be determined by the Board, and its determination shall be final, binding and conclusive. 

 

	 	10.	 RIGHTS AS A STOCKHOLDER,
DIRECTOR, EMPLOYEE OR CONSULTANT. 

 The
Participant shall have no rights as a stockholder with respect to any shares covered by the Option until the date of the issuance of the shares for which the Option has been exercised (as evidenced by the appropriate entry on the books of the
Company or of a duly authorized transfer agent of the Company). No adjustment shall be made for dividends, distributions or other rights for which the record date is prior to the date the shares are issued, except as provided in Section 9. If
the Participant is an Employee, the Participant understands and acknowledges that, except as otherwise provided in a separate, written employment agreement between a Participating Company and the Participant, the Participant’s employment is
“at will” and is for no specified term. Nothing in this Option Agreement shall confer upon the Participant any right to continue in the Service of a Participating Company or interfere in any way with any right of the Participating Company
Group to terminate the Participant’s Service as a Director, an Employee or Consultant, as the case may be, at any time. 
  

	 	11.	 RIGHT OF FIRST REFUSAL.

 11.1 Grant of Right of First Refusal. Except as provided in Section 11.7 and Section 17 below, in
the event the Participant, the Participant’s legal representative, or other holder of shares acquired upon exercise of the Option proposes to sell, exchange, transfer, pledge, or otherwise dispose of any Vested Shares (the “Transfer
Shares”) to any person or entity, including, without limitation, any stockholder of a Participating Company, the Company shall have the right to repurchase the Transfer Shares under the terms and subject to the conditions set forth in
this Section 11 (the “Right of First Refusal”). 
 11.2 Notice of Proposed Transfer. Prior to any
proposed transfer of the Transfer Shares, the Participant shall deliver written notice (the “Transfer Notice”) to the Company describing fully the proposed transfer, including the number of Transfer Shares, the name and
address of the proposed transferee (the “Proposed Transferee”) and, if the transfer is voluntary, the proposed transfer price, and containing such information necessary to show the bona fide nature of the proposed transfer.
In the event of a bona fide gift or involuntary transfer, the proposed transfer price shall be deemed to be the Fair Market Value of the Transfer Shares, as determined by the Board in good faith. If the Participant proposes to transfer any Transfer
Shares to more than one Proposed Transferee, the Participant shall provide a separate Transfer Notice for the proposed transfer to each Proposed Transferee. The Transfer Notice shall be signed by both the Participant and the Proposed Transferee and
must constitute a binding commitment of the Participant and the Proposed Transferee for the transfer of the Transfer Shares to the Proposed Transferee subject only to the Right of First Refusal. 

  
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 11.3 Bona Fide Transfer. If the Company determines that the information provided by
the Participant in the Transfer Notice is insufficient to establish the bona fide nature of a proposed voluntary transfer, the Company shall give the Participant written notice of the Participant’s failure to comply with the procedure described
in this Section 11, and the Participant shall have no right to transfer the Transfer Shares without first complying with the procedure described in this Section 11. The Participant shall not be permitted to transfer the Transfer Shares if
the proposed transfer is not bona fide. 
 11.4 Exercise of Right of First Refusal. If the Company determines the proposed transfer to
be bona fide, the Company shall have the right to purchase all, but not less than all, of the Transfer Shares (except as the Company and the Participant otherwise agree) at the purchase price and on the terms set forth in the Transfer Notice by
delivery to the Participant of a notice of exercise of the Right of First Refusal within thirty (30) days after the date the Transfer Notice is delivered to the Company. The Company’s exercise or failure to exercise the Right of First
Refusal with respect to any proposed transfer described in a Transfer Notice shall not affect the Company’s right to exercise the Right of First Refusal with respect to any proposed transfer described in any other Transfer Notice, whether or
not such other Transfer Notice is issued by the Participant or issued by a person other than the Participant with respect to a proposed transfer to the same Proposed Transferee. If the Company exercises the Right of First Refusal, the Company and
the Participant shall thereupon consummate the sale of the Transfer Shares to the Company on the terms set forth in the Transfer Notice within sixty (60) days after the date the Transfer Notice is delivered to the Company (unless a longer
period is offered by the Proposed Transferee); provided, however, that in the event the Transfer Notice provides for the payment for the Transfer Shares other than in cash, the Company shall have the option of paying for the Transfer Shares by the
present value cash equivalent of the consideration described in the Transfer Notice as reasonably determined by the Company. For purposes of the foregoing, cancellation of any indebtedness of the Participant to any Participating Company shall be
treated as payment to the Participant in cash to the extent of the unpaid principal and any accrued interest canceled. Notwithstanding anything contained in this Section to the contrary, the period during which the Company may exercise the Right of
First Refusal and consummate the purchase of the Transfer Shares from the Participant shall terminate no sooner than the completion of a period of eight (8) months following the date on which the Participant acquired the Transfer Shares upon
exercise of the Option. 
 11.5 Failure to Exercise Right of First Refusal. If the Company fails to exercise the Right of First
Refusal in full (or to such lesser extent as the Company and the Participant otherwise agree) within the period specified in Section 11.4 above, the Participant may conclude a transfer to the Proposed Transferee of the Transfer Shares on the
terms and conditions described in the Transfer Notice, provided such transfer occurs not later than ninety (90) days following delivery to the Company of the Transfer Notice or, if applicable, following the end of the period described in the
last sentence of Section 11.4. The Company shall have the right to demand further assurances from the Participant and the Proposed Transferee (in a form satisfactory to the Company) that the transfer of the Transfer Shares was actually carried
out on the terms and conditions described in the Transfer Notice. No Transfer Shares shall be transferred on the books of the Company until the Company has received such assurances, if so demanded, and has approved the proposed transfer as bona
fide. Any proposed transfer on terms and conditions different from those described in the Transfer Notice, as well as any subsequent proposed transfer by the Participant, shall again be subject to the Right of First Refusal and shall require
compliance by the Participant with the procedure described in this Section 11. 

  
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 11.6 Transferees of Transfer Shares. All transferees of the Transfer Shares or any
interest therein, other than the Company, shall be required as a condition of such transfer to agree in writing (in a form satisfactory to the Company) that such transferee shall receive and hold such Transfer Shares or interest therein subject to
all of the terms and conditions of this Option Agreement, including this Section 11 providing for the Right of First Refusal with respect to any subsequent transfer. Any sale or transfer of any shares acquired upon exercise of the Option shall
be void unless the provisions of this Section 11 are met. 
 11.7 Transfers Not Subject to Right of First Refusal. The Right of
First Refusal shall not apply to any transfer or exchange of the shares acquired upon exercise of the Option if such transfer or exchange is in connection with an Ownership Change Event. If the consideration received pursuant to such transfer or
exchange consists of stock of a Participating Company, such consideration shall remain subject to the Right of First Refusal unless the provisions of Section 11.9 result in a termination of the Right of First Refusal. In addition,
notwithstanding anything to the contrary contained in this Section 11 or the Plan, the transfer of any or all of the shares during the Participant’s lifetime or on the Participant’s death by will or intestacy to Participant’s
Immediate Family or a trust for the benefit of Participant’s Immediate Family shall be exempt from the provisions of this Section 11. “Immediate Family” as used in this Agreement shall mean lineal descendant or
antecedent, spouse (or spouse’s antecedents), father, mother, brother or sister (or their descendants), stepchild (or their antecedents or descendants), aunt or uncle (or their antecedents or descendants), brother-in-law or sister-in-law (or their antecedents or descendants) and shall include adoptive relationships. In such case,
the transferee or other recipient shall receive and hold the shares so transferred subject to the provisions of this Section 11, and there shall be no further transfer of such shares except in accordance with the terms of this Section 11.

 11.8 Assignment of Right of First Refusal. The Company shall have the right to assign the Right of First Refusal at any time,
whether or not there has been an attempted transfer, to one or more persons as may be selected by the Company. 
 11.9 Early Termination
of Right of First Refusal. The other provisions of this Option Agreement notwithstanding, the Right of First Refusal shall terminate and be of no further force and effect upon (a) the occurrence of a Change in Control, unless the Acquiror
assumes the Company’s rights and obligations under the Option or substitutes a substantially equivalent option for the Acquiror’s stock for the Option, or (b) the existence of a public market for the class of shares subject to the
Right of First Refusal. A “public market” shall be deemed to exist if (i) such stock is listed on a national securities exchange (as that term is used in the Exchange Act) or (ii) such stock is traded on the over
the counter market and prices therefor are published daily on business days in a recognized financial journal. 

  
 11 

	 	12.	 VESTED SHARE REPURCHASE
OPTION. 

 12.1 Grant of Vested Share Repurchase Option. Except as provided in
Section 12.4 below, in the event of the occurrence of any Repurchase Event, as defined below, the Company shall have the right to repurchase the shares of Stock acquired by the Participant pursuant to the Option (the “Repurchase
Shares”) under the terms and subject to the conditions set forth in this Section (the “Vested Share Repurchase Option”). Each of the following events shall constitute a “Repurchase Event”:

 (a) Termination of the Participant’s Service for any reason or no reason, with or without Cause, including death or Disability. The
Repurchase Period, as defined below, shall commence on the date of termination of the Participant’s Service. 
 (b) The receivership,
bankruptcy or other creditor’s proceeding regarding the Participant or the taking of any of the Participant’s shares of Stock by legal process, such as a levy of execution. The Repurchase Period, as defined below, shall commence on the
date the Company receives actual notice of the commencement of pendency of the receivership, bankruptcy or other creditor’s proceeding or the date of such taking, as the case may be. The Fair Market Value of the Repurchase Shares shall be
determined as of the last day of the month preceding the month in which the proceeding involved commenced or the taking occurred. 
 12.2
Exercise of Vested Share Repurchase Option. The Company may exercise the Vested Share Repurchase Option by written notice to the Participant, the Participant’s legal representative, or other holder of the Repurchase Shares, as the case
may be, during the Repurchase Period. The “Repurchase Period” shall be the period commencing at the time set forth in Section 12.1 above and ending one year following the commencement of the Repurchase Period. If the
Company fails to give notice during the Repurchase Period, the Vested Share Repurchase Option shall terminate (unless the Company and the Participant have extended the time for the exercise of the Vested Share Repurchase Option) unless and until
there is a subsequent Repurchase Event. Notwithstanding a termination of the Vested Share Repurchase Option, the remaining provisions of this Agreement shall remain in full force and effect. If there is a subsequent Repurchase Event, the Vested
Share Repurchase Option shall again become exercisable as provided in this Section 12. The Vested Share Repurchase Option must be exercised, if at all, for all of the Repurchase Shares, except as the Company and the Participant otherwise agree.

 12.3 Payment for Repurchase Shares. The repurchase price per share being repurchased by the Company pursuant to the Vested Share
Repurchase Option shall be an amount equal to the Fair Market Value of the shares determined as of the date of the Repurchase Event (except as otherwise provided in Section 12.1(b) and in the following sentence) by the Board in good faith.
Notwithstanding the foregoing, if the Participant’s Service is terminated for Cause, then the repurchase price for the shares repurchased by the Company shall be the lesser of (a) the amount paid for such shares by the Participant; and
(b) the amount determined pursuant to the preceding sentence. Payment by the Company to the Participant shall be made in cash on or before the last day of the Repurchase Period. For purposes of the foregoing, cancellation of any indebtedness of
the Participant to any Participating Company shall be treated as payment to the Participant in cash to the extent of the unpaid principal and any accrued interest canceled. 

  
 12 

 12.4 Transfers Not Subject to Vested Share Repurchase Option. The Vested Share
Repurchase Option shall not apply to any transfer or exchange of shares acquired upon exercise of the Option if such transfer or exchange is in connection with an Ownership Change Event. If the consideration received pursuant to such transfer or
exchange consists of securities of a Participating Company, such consideration will remain subject to the Vested Share Repurchase Option unless the provisions of Section 12.6 result in a termination of the Vested Share Repurchase Option. 

12.5 Assignment of Vested Share Repurchase Option. The Company shall have the right to assign the Vested Share Repurchase Option at any
time, whether or not such option is then exercisable, to one or more persons as may be selected by the Company. 
 12.6 Early Termination
of Vested Share Repurchase Option. The other provisions of this Option Agreement notwithstanding, the Vested Share Repurchase Option shall terminate and be of no further force and effect upon the existence of a “public market” (as
defined in Section 11) for the class of securities subject to the Vested Share Repurchase Option. 
  

	 	13.	 STOCK DISTRIBUTIONS SUBJECT TO
OPTION AGREEMENT. 

 If, from time to time, there is any stock
dividend, stock split or other change, as described in Section 9, in the character or amount of any of the outstanding stock of the corporation the stock of which is subject to the provisions of this Option Agreement, then in such event any and
all new, substituted or additional securities to which the Participant is entitled by reason of the Participant’s ownership of the shares acquired upon exercise of the Option shall be immediately subject to the Right of First Refusal with the
same force and effect as the shares subject to the Right of First Refusal immediately before such event. 
  

	 	14.	 NOTICE OF SALES UPON
DISQUALIFYING DISPOSITION. 

 The Participant shall dispose of the
shares acquired pursuant to the Option only in accordance with the provisions of this Option Agreement. In addition, if the Grant Notice designates this Option as an Incentive Stock Option, the Participant shall (a) promptly notify the Chief
Financial Officer of the Company if the Participant disposes of any of the shares acquired pursuant to the Option within one (1) year after the date the Participant exercises all or part of the Option or within two (2) years after the Date
of Grant and (b) provide the Company with a description of the circumstances of such disposition. Until such time as the Participant disposes of such shares in a manner consistent with the provisions of this Option Agreement, unless otherwise
expressly authorized by the Company, the Participant shall hold all shares acquired pursuant to the Option in the Participant’s name (and not in the name of any nominee) for the one-year period
immediately after the exercise of the Option and the two-year period immediately after Date of Grant. At any time during the one-year or
two-year periods set forth above, the Company may place a legend on any certificate representing shares acquired pursuant to the Option requesting the transfer agent for the Company’s stock to notify the
Company of any such transfers. The obligation of the Participant to notify the Company of any such transfer shall continue notwithstanding that a legend has been placed on the certificate pursuant to the preceding sentence. 

  
 13 

	 	15.	 LEGENDS. 

The Company may at any time place legends referencing the Right of First Refusal, the Vested Share Repurchase Option and any applicable
federal, state or foreign securities law restrictions on all certificates representing shares of stock subject to the provisions of this Option Agreement. The Participant shall, at the request of the Company, promptly present to the Company any and
all certificates representing shares acquired pursuant to the Option in the possession of the Participant in order to carry out the provisions of this Section. Unless otherwise specified by the Company, legends placed on such certificates may
include, but shall not be limited to, the following: 
 15.1 “THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, TRANSFERRED, ASSIGNED OR HYPOTHECATED UNLESS THERE IS AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT COVERING SUCH SECURITIES, THE SALE IS MADE IN ACCORDANCE WITH RULE 144 OR
RULE 701 UNDER THE ACT, OR THE COMPANY RECEIVES AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE COMPANY, STATING THAT SUCH SALE, TRANSFER, ASSIGNMENT OR HYPOTHECATION IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF SUCH
ACT.” 
 15.2 “THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO CERTAIN RESTRICTIONS ON TRANSFER AND REPURCHASE OPTIONS IN
FAVOR OF THE COMPANY OR ITS ASSIGNEE SET FORTH IN AN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER, OR SUCH HOLDER’’S PREDECESSOR IN INTEREST, A COPY OF WHICH IS ON FILE AT THE PRINCIPAL OFFICE OF THIS COMPANY.” 

 

	 	16.	 LOCK-UP
AGREEMENT. 

 The Participant hereby agrees that in the event of any underwritten
public offering of stock, including an initial public offering of stock, made by the Company pursuant to an effective registration statement filed under the Securities Act, the Participant shall not offer, sell, contract to sell, pledge,
hypothecate, grant any option to purchase or make any short sale of, or otherwise dispose of any shares of stock of the Company or any rights to acquire stock of the Company for such period of time from and after the effective date of such
registration statement as may be established by the underwriter for such public offering; provided, however, that such period of time shall not exceed one hundred eighty (180) days from the effective date of the registration
statement to be filed in connection with such public offering; provided, further, however, that such one hundred eighty (180) day period may be extended for an additional period, not to exceed twenty (20) days,
upon the request of the Company or the underwriter to accommodate regulatory restrictions on (i) the publication or other distribution of research reports and (ii) analyst recommendations and opinions, including
but not limited to, the restrictions contained in NASD Rule 2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments thereto). The foregoing limitation shall not apply to shares
registered in the public offering under the Securities Act. The Participant hereby agrees to enter into any agreement reasonably required by the underwriters to implement the foregoing within a reasonable timeframe if so requested by the Company.

  
 14 

	 	17.	 RESTRICTIONS ON TRANSFER OF
SHARES. 

 At any time prior to the existence of a public market for the Stock, the
Board may prohibit the Participant and any transferee of such Participant from selling, transferring, assigning, pledging, or otherwise disposing of or encumbering any shares acquired pursuant to the Option (each, a
“Transfer”) without the prior written consent of the Board. The Board may withhold consent for any reason, including without limitation any Transfer (i) to any individual or entity identified by the Company as a
potential competitor or considered by the Company to be unfriendly, or (ii) if such Transfer increases the risk of the Company having a class of security held of record by such number of persons as would require the Company to register any
class of securities under the Exchange Act; or (iii) if such Transfer would result in the loss of any federal or state securities law exemption relied upon by the Company in connection with the initial issuance of such shares or the issuance of
any other securities; or (iv) if such Transfer is facilitated in any manner by any public posting, message board, trading portal, Internet site, or similar method of communication, including without limitation any trading portal or Internet
site intended to facilitate secondary transfers of securities; or (v) if such Transfer is to be effected in a brokered transaction; or (vi) if such Transfer would be of less than all of the shares of Stock then held by the stockholder and
its affiliates or is to be made to more than a single transferee. No shares acquired upon exercise of the Option may be sold, exchanged, transferred (including, without limitation, any transfer to a nominee or agent of the Participant), assigned,
pledged, hypothecated or otherwise disposed of, including by operation of law in any manner which violates any of the provisions of this Option Agreement, and any such attempted disposition shall be void. The Company shall not be required
(a) to transfer on its books any shares which will have been transferred in violation of any of the provisions set forth in this Option Agreement or (b) to treat as owner of such shares or to accord the right to vote as such owner or to
pay dividends to any transferee to whom such shares will have been so transferred. In addition, notwithstanding anything to the contrary contained in this Section 17 or the Plan, the transfer of any or all of the shares during the
Participant’s lifetime or on the Participant’s death by will or intestacy to Participant’s Immediate Family or a trust for the benefit of Participant’s Immediate Family shall be exempt from the provisions of this Section 17.
In such case, the transferee or other recipient shall receive and hold the shares so transferred subject to the provisions of this Section 17, and there shall be no further transfer of such shares except in accordance with the terms of this
Section 17. 
  

	 	18.	 MISCELLANEOUS PROVISIONS. 

18.1 Termination or Amendment. The Board may terminate or amend the Plan or the Option at any time; provided, however, that except as
provided in Section 8 in connection with a Change in Control, no such termination or amendment may have a materially adverse effect on the Option or any unexercised portion thereof without the consent of the Participant unless such termination
or amendment is necessary to comply with any applicable law or government regulation, including, but not limited to Section 409A of the Code. No amendment or addition to this Option Agreement shall be effective unless in writing. 

  
 15 

 18.2 Compliance with Section 409A. The Company intends that income
realized by the Participant pursuant to the Plan and this Option Agreement will not be subject to taxation under Section 409A of the Code. The provisions of the Plan and this Option Agreement shall be interpreted and construed in favor of
satisfying any applicable requirements of Section 409A of the Code. The Company, in its reasonable discretion, may amend (including retroactively) the Plan and this Agreement in order to conform to the applicable requirements of
Section 409A of the Code, including amendments to facilitate the Participant’s ability to avoid taxation under Section 409A of the Code. However, the preceding provisions shall not be construed as a guarantee by the Company of any
particular tax result for income realized by the Participant pursuant to the Plan or this Option Agreement. In any event, and except for the responsibilities of the Company set forth in Section 4.4, no Participating Company shall be
responsible for the payment of any applicable taxes incurred by the Participant on income realized by the Participant pursuant to the Plan or this Option Agreement. 

18.3 Further Instruments. The parties hereto agree to execute such further instruments and to take such further action as may reasonably
be necessary to carry out the intent of this Option Agreement. 
 18.4 Binding Effect. This Option Agreement shall inure to the
benefit of the successors and assigns of the Company and, subject to the restrictions on transfer set forth herein, be binding upon the Participant and the Participant’s heirs, executors, administrators, successors and assigns. 

18.5 Delivery of Documents and Notices. Any document relating to participation in the Plan, or any notice required or permitted
hereunder shall be given in writing and shall be deemed effectively given (except to the extent that this Option Agreement provides for effectiveness only upon actual receipt of such notice) upon personal delivery, electronic delivery at the e-mail address, if any, provided for the Participant by a Participating Company, or upon deposit in the U.S. Post Office or foreign postal service, by registered or certified mail, or with a nationally recognized
overnight courier service, with postage and fees prepaid, addressed to the other party at the address of such party set forth in the Grant Notice or at such other address as such party may designate in writing from time to time to the other party.

 (a) Description of Electronic Delivery. The Plan documents, which may include but do not necessarily include: the Plan, the
Grant Notice, this Option Agreement, and any reports of the Company provided generally to the Company’s stockholders, may be delivered to the Participant electronically. In addition, if permitted by the Company, the Participant may deliver
electronically the Grant Notice and Exercise Notice called for by Section 4.2 to the Company or to such third party involved in administering the Plan as the Company may designate from time to time. Such means of electronic delivery may include
but do not necessarily include the delivery of a link to a Company intranet or the Internet site of a third party involved in administering the Plan, the delivery of the document via e-mail or such other means
of electronic delivery specified by the Company. 
 (b) Consent to Electronic Delivery. The Participant acknowledges that the
Participant has read Section 18.5(a) of this Option Agreement and consents to the electronic delivery of the Plan documents and, if permitted by the Company, the delivery of the Grant Notice and Exercise Notice, as described in
Section 18.5(a). The Participant acknowledges that he or she may receive from the Company a paper copy of any documents delivered electronically at no cost to the Participant by contacting the Company by telephone or in writing. The Participant
further 

  
 16 

 
acknowledges that the Participant will be provided with a paper copy of any documents if the attempted electronic delivery of such documents fails. Similarly, the Participant understands that the
Participant must provide the Company or any designated third party administrator with a paper copy of any documents if the attempted electronic delivery of such documents fails. The Participant may revoke his or her consent to the electronic
delivery of documents described in Section 18.5(a) or may change the electronic mail address to which such documents are to be delivered (if Participant has provided an electronic mail address) at any time by notifying the Company of such
revoked consent or revised e-mail address by telephone, postal service or electronic mail. Finally, the Participant understands that he or she is not required to consent to electronic delivery of documents
described in Section 18.5(a). 
 18.6 Waiver of Information Rights. Participant acknowledges and understands that, but for the
waiver made herein, Participant would be entitled, upon written demand under oath stating the purpose thereof, to inspect for any proper purposes, and to make copies and extracts from, the Company’s stock ledger, a list of its stockholders, and
its other books and records, and the books and records of subsidiaries of the Company, if any, under the circumstances and in the manner provided in Section 220 of the Delaware General Corporation Law (any and all such rights, and any and all
such other rights of Participant as may be provided for in Section 220 of the Delaware General Corporation Law, the “Inspection Rights”). In light of the foregoing, until the first sale of Common Stock of the Company to
the general public pursuant to a registration statement filed with and declared effective by the Securities and Exchange Commission under the Securities Act of 1933, as amended, Participant hereby unconditionally and irrevocably waives the
Inspection Rights, whether such Inspection Rights would be exercisable or pursued directly or indirectly pursuant to Section 220 of the Delaware General Corporation Law or otherwise, and covenants and agrees never to directly or indirectly
commence, voluntarily aid in any way, prosecute, assign, transfer or cause to be commenced any claim, action, cause of action, or other proceeding to pursue or exercise the Inspection Rights. The foregoing waiver applies to the Inspection Rights of
Participant in Participant’s capacity as a stockholder and shall not affect any rights of a director, in his or her capacity as such, under Section 220 of the Delaware General Corporation Law. The foregoing waiver shall not apply to any
contractual inspection rights of Participant under any written agreement with the Company. 
 18.7 Integrated Agreement. The Grant
Notice, this Option Agreement and the Plan, together with any employment, service or other agreement with the Participant and a Participating Company referring to the Option, shall constitute the entire understanding and agreement of the Participant
and the Participating Company Group with respect to the subject matter contained herein or therein and supersede any prior agreements, understandings, restrictions, representations, or warranties among the Participant and the Participating Company
Group with respect to such subject matter. To the extent contemplated herein or therein, the provisions of the Grant Notice, the Option Agreement and the Plan shall survive any exercise of the Option and shall remain in full force and effect. 

18.8 Applicable Law. This Option Agreement shall be governed by the laws of the State of California as such laws are applied to
agreements between California residents entered into and to be performed entirely within the State of California. 

  
 17 

 18.9 Counterparts. The Grant Notice may be executed in counterparts, each of which
shall be deemed an original, but all of which together shall constitute one and the same instrument. 

  
 18 

					
	 ☐ Incentive Stock Option
	 		  	
Participant:                 
                               

			
	 ☐ Nonstatutory Stock Option
	 		  	
Date:                  
                                        

 STOCK OPTION EXERCISE NOTICE 

Histogen Inc. 
 Attention: Chief Financial Officer 

                          
                               

                          
                               

Ladies and Gentlemen: 
 1. Option.
I was granted an option (the “Option”) to purchase shares of the common stock (the “Shares”) of Histogen Inc. (the “Company”) pursuant to the Company’s 2017 Stock Plan (the
“Plan”), my Notice of Grant of Stock Option (the “Grant Notice”) and my Stock Option Agreement (the “Option Agreement”) as follows: 

 

					
	 Date of Grant: 
	  		  	                                    
                                
			
	 Number of Option Shares: 
	  		  	                                    
                                
			
	 Exercise Price per Share:
	  		  	$                                   
                               

 2. Exercise of Option. I hereby elect to exercise the Option to purchase the following number of
Shares, all of which are Vested Shares, in accordance with the Grant Notice and the Option Agreement: 
  

					
	 Total Shares Purchased: 
	  		  	
		
	 Total Exercise Price (Total Shares X Price per Share):
	  	$                                   
                               

 3. Payments. I enclose payment in full of the total exercise price for the Shares in the
following form(s), as authorized by my Option Agreement: 
  

					
	 ☐ Cash:
	 		  	$                                   
                               
			
	 ☐ Check:
	 		  	$                                   
                               
			
	 ☐ Stock Tender Exercise:
	 		  	           Contact Plan
Administrator

			
	 ☐ Cashless Exercise:
	 		  	           Contact Plan
Administrator

			
	 ☐ Net Exercise:
	 		  	           Contact Plan
Administrator

  
 1 

 4. Tax Withholding. I authorize payroll withholding and otherwise will make
adequate provision for the federal, state, local and foreign tax withholding obligations of the Company, if any, in connection with the Option. If I am exercising a Nonstatutory Stock Option, I enclose payment in full of my withholding taxes, if
any, as follows: 
 (Contact Plan Administrator for amount of tax due.) 

 

							
	 ☐ Cash:
	 		  	$	                                   
                                         
         	 
			
	 ☐ Check:
	 		  	$	                                   
                                         
         	 

  

	 	5.	 Participant Information. 

 

					
	 My address is:
	 		 	
                
                                         
                                         
  

			
		 		 	
                
                                         
                                         
  

			
		 		 	
                
                                         
                                         
  

			
	 My Social Security Number is:
	 		 	
                
                                         
                                         
  

 6. Notice of Disqualifying Disposition. If the Option is an Incentive Stock Option, I agree that
I will promptly notify the Chief Financial Officer of the Company if I transfer any of the Shares within one (1) year from the date I exercise all or part of the Option or within two (2) years of the Date of Grant. 

7. Binding Effect. I agree that the Shares are being acquired in accordance with and subject to the terms, provisions and
conditions of the Grant Notice, the Option Agreement, including the Right of First Refusal and Vested Share Repurchase Option set forth therein, and the Plan, to all of which I hereby expressly assent. This Agreement shall inure to the benefit of
and be binding upon my heirs, executors, administrators, successors and assigns. 
 8. Transfer. I understand and acknowledge
that the Shares have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), and that consequently the Shares must be held indefinitely unless they are subsequently registered under the
Securities Act, an exemption from such registration is available, or they are sold in accordance with Rule 144 or Rule 701 under the Securities Act. I further understand and acknowledge that the Company is under no obligation to register the Shares.
I understand that the certificate or certificates evidencing the Shares will be imprinted with legends which prohibit the transfer of the Shares unless they are registered or such registration is not required in the opinion of legal counsel
satisfactory to the Company. 
 I am aware that Rule 144 under the Securities Act, which permits limited public resale of securities
acquired in a nonpublic offering, is not currently available with respect to the Shares and, in any event, is available only if certain conditions are satisfied. I understand that any sale of the Shares that might be made in reliance upon Rule 144
may only be made in limited amounts in accordance with the terms and conditions of such rule and that a copy of Rule 144 will be delivered to me upon request. 

  
 2 

 I understand that I am purchasing the Shares pursuant to the terms of the Plan, the Grant
Notice and my Option Agreement, copies of which I have received and carefully read and understand. 
  

	
	 Very truly yours,

	
	  

	 (Signature)

 

	
	 Receipt of the above is hereby acknowledged.

	
	 Histogen Inc.

 

			
	By:	 	  

		
	Title:	 	  

		
	Dated:	 	  

  
 3EX-10.45

 Exhibit 10.45 

HISTOGEN INC. 
 2007
STOCK PLAN 
  

	 	1.	 ESTABLISHMENT, PURPOSE AND TERM OF PLAN. 

1.1 Establishment. The Histogen Inc. 2007 Stock Plan (the “Plan”) is hereby established effective as of
November 28, 2007. 
 1.2 Purpose. The purpose of the Plan is to advance the interests of the Participating Company Group and its
shareholders by providing an incentive to attract, retain and reward persons performing services for the Participating Company Group and by motivating such persons to contribute to the growth and profitability of the Participating Company Group. The
Company intends that the Plan comply with Section 409A of the Code (including any amendments or replacements of such section), and the Plan shall be so construed. 

1.3 Term of Plan. The Plan shall continue in effect until its termination by the Board; provided, however, that, to the extent required
by applicable law, all Awards shall be granted, if at all, within ten (10) years from the earlier of the date the Plan is adopted by the Board or the date the Plan is duly approved by the shareholders of the Company. 

 

	 	2.	 DEFINITIONS AND CONSTRUCTION. 

2.1 Definitions. Whenever used herein, the following terms shall have their respective meanings set forth below: 

(a) “Award” means an Option or Stock Purchase Right granted under the Plan. 

(b) “A ward Agreement” means a written or electronic agreement between the Company and a Participant setting forth the
terms, conditions and restrictions of the Award granted to the Participant. 
 (c) “Board” means the Board of
Directors of the Company. If one or more Committees have been appointed by the Board to administer the Plan, “Board” also means such Committee(s). 

(d) “Change in Control” means, unless such term or an equivalent term is otherwise defined with respect to an Award by
the Participant’s Award Agreement or written contract of employment or service, the occurrence of any of the following: 
 (i) an
Ownership Change Event or a series of related Ownership Change Events (collectively, a “Transaction”) in which the shareholders of the Company immediately before the Transaction do not retain immediately after the
Transaction, in substantially the same proportions as their ownership of shares of the Company’s voting stock immediately before the Transaction, direct or indirect beneficial ownership of more than fifty percent (50%) of the total combined
voting power of the outstanding voting securities of the Company or, in the case of an Ownership Change Event described in Section 2.l(s)(iii), the entity to which the assets of the Company were transferred (the “Transferee”),
as the case may be; or 

 (ii) the liquidation or dissolution of the Company. 

For purposes of the preceding sentence, indirect beneficial ownership shall include, without limitation, an interest resulting from ownership of the voting
securities of one or more corporations or other business entities which own the Company or the Transferee, as the case may be, either directly or through one or more subsidiary corporations or other business entities. The Board shall have the right
to determine whether multiple sales or exchanges of the voting securities of the Company or multiple Ownership Change Events are related, and its determination shall be final, binding and conclusive. 

(e) “Code” means the Internal Revenue Code of 1986, as amended, and any applicable regulations promulgated thereunder.

 (f) “Committee” means the compensation committee or other committee of the Board duly appointed to administer the
Plan and having such powers as shall be specified by the Board. Unless the powers of the Committee have been specifically limited, the Committee shall have all of the powers of the Board granted herein, including, without limitation, the power to
amend or terminate the Plan at any time, subject to the terms of the Plan and any applicable limitations imposed by law. 
 (g)
“Company” means Histogen Inc., a California corporation, or any successor corporation thereto. 
 (h)
“Consultant” means a person engaged to provide consulting or advisory services (other than as an Employee or a Director) to a Participating Company, provided that the identity of such person, the nature of such services or
the entity to which such services are provided would not preclude the Company from offering or selling securities to such person pursuant to the Plan in reliance on either the exemption from registration provided by Rule 701 under the Securities Act
or, if the Company is required to file reports pursuant to Section 13 or 15(d) of the Exchange Act, registration on a Form S-8 Registration Statement under the Securities Act. 

(i) “Director” means a member of the Board or of the board of directors of any other Participating Company. 

(j) “Disability” means the inability of the Participant, in the opinion of a qualified physician acceptable to the
Company, to perform the major duties of the Participant’s position with the Participating Company Group because of the sickness or injury of the Participant. 

(k) “Employee” means any person treated as an employee (including an Officer or a Director who is also treated as an
employee) in the records of a Participating Company and, with respect to any Incentive Stock Option granted to such person, who is an employee for purposes of Section 422 of the Code; provided, however, that neither service as a 

  
 2 

 
Director nor payment of a director’s fee shall be sufficient to constitute employment for purposes of the Plan. The Company shall determine in good faith and in the exercise of its
discretion whether an individual has become or has ceased to be an Employee and the effective date of such individual’s employment or termination of employment, as the case may be. For purposes of an individual’s rights, if any, under the
terms of the Plan as of the time of the Company’s determination of whether or not the individual is an Employee, all such determinations by the Company shall be final, binding and conclusive as to such rights, if any, notwithstanding that the
Company or any court of law or governmental agency subsequently makes a contrary determination as to such individual’s status as an Employee. 

(l) “Exchange Act” means the Securities Exchange Act of 1934, as amended. 

(m) “Fair Market Value” means, as of any date, the value of a share of Stock or other property as determined by
the Board, in its discretion, or by the Company, in its discretion, if such determination is expressly allocated to the Company herein, subject to the following: 

(i) If, on such date, the Stock is listed on a national or regional securities exchange or market system, the Fair Market Value of a share of
Stock shall be the closing price of a share of Stock (or the mean of the closing bid and asked prices of a share of Stock if the Stock is so quoted instead) as quoted on the Nasdaq National Market, The Nasdaq SmallCap Market or such other national
or regional securities exchange or market system constituting the primary market for the Stock, as reported in The Wall Street Journal or such other source as the Company deems reliable. If the relevant date does not fall on a day on which
the Stock has traded on such securities exchange or market system, the date on which the Fair Market Value shall be established shall be the last day on which the Stock was so traded prior to the relevant date, or such other appropriate day as shall
be determined by the Board, in its discretion. 
 (ii) If, on such date, the Stock is not listed on a national or regional securities
exchange or market system, the Fair Market Value of a share of Stock shall be as determined by the Board in good faith without regard to any restriction other than a restriction which, by its terms, will never lapse, and subject to the applicable
requirements, if any, of Section 409A of the Code and Section 260.140.50 of Title 10 of the California Code of Regulations. 
 (n)
“Incentive Stock Option” means an Option intended to be (as set forth in the Award Agreement) and which qualifies as an incentive stock option within the meaning of Section 422(b) of the Code. 

(o) “Insider” means an Officer, a Director of the Company or other person whose transactions in Stock are subject to
Section 16 of the Exchange Act. 
 (p) “Nonstatutory Stock Option” means an Option not intended to be
(as set forth in the Award Agreement) or which does not qualify as an Incentive Stock Option. 

  
 3 

 (q) “Officer” means any person designated by the Board as an
officer of the Company. 
 (r) “Option” means a right granted under Section 6 to purchase Stock pursuant to the
terms and conditions of the Plan. An Option may be either an Incentive Stock Option or a Nonstatutory Stock Option. 
 (s)
“Ownership Change Event” means the occurrence of any of the following with respect to the Company: (i) the direct or indirect sale or exchange in a single or series of related transactions by the shareholders of the
Company of more than fifty percent (50%) of the voting stock of the Company; (ii) a merger or consolidation in which the Company is a party; or (iii) the sale, exchange, or transfer of all or substantially all of the assets of the Company.

 (t) “Parent Corporation” means any present or future “parent corporation” of the Company, as defined in
Section 424(e) of the Code. 
 (u) “Participant” means any eligible person who has been granted one or more
Awards. 
 (v) “Participating Company” means the Company or any Parent Corporation or Subsidiary Corporation. 

(w) “Participating Company Group” means, at any point in time, all entities collectively which are then Participating
Companies. 
 (x) “Rule 16b-3” means Rule
16b-3 under the Exchange Act, as amended from time to time, or any successor rule or regulation. 

(y) “Securities Act” means the Securities Act of 1933, as amended. 

(z) “Service” means a Participant’s employment or service with the Participating Company Group, whether in the
capacity of an Employee, a Director or a Consultant. A Participant’s Service shall not be deemed to have terminated merely because of a change in the capacity in which the Participant renders Service to the Participating Company Group or a
change in the Participating Company for which the Participant renders such Service, provided that there is no interruption or termination of the Participant’s Service. Furthermore, a Participant’s Service shall not be deemed to have
terminated if the Participant takes any military leave, sick leave, or other bona fide leave of absence approved by the Company. However, if any such leave taken by a Participant exceeds ninety (90) days, then on the ninety-first (91st) day
following the commencement of such leave the Participant’s Service shall be deemed to have terminated, unless the Participant’s right to return to Service is guaranteed by statute or contract. Notwithstanding the foregoing, unless
otherwise designated by the Company or required by law, a leave of absence shall not be treated as Service for purposes of determining vesting under the Participant’s Award Agreement. Except as otherwise provided by the Board, in its
discretion, the Participant’s Service shall be deemed to have terminated either upon an actual termination of Service or upon the corporation for which the Participant performs Service ceasing to be a Participating Company. Subject to the
foregoing, the Company. in its discretion, shall determine whether the Participant’s Service has terminated and the effective date of and reason for such termination. 

  
 4 

 (aa) “Stock” means the common stock of the Company, as
adjusted from time to time in accordance with Section 4.2. 
 (bb) “Stock Purchase Right” means a right
granted under Section 7 to purchase Stock pursuant to the terms and conditions of the Plan. 
 (cc) “Subsidiary
Corporation” means any present or future “subsidiary corporation” of the Company, as defined in Section 424(f) of the Code. 

(dd) “Ten Percent Shareholder” means a person who, at the time an Award is granted to such person, owns stock
possessing more than ten percent (10%) of the total combined voting power (as defined in Section 194.5 of the California Corporations Code) of all classes of stock of a Participating Company within the meaning of Section 422(6)(6) of the
Code. 
 2.2 Construction. Captions and titles contained herein are for convenience only and shall not affect the meaning or
interpretation of any provision of the Plan. Except when otherwise indicated by the context, the singular shall include the plural and the plural shall include the singular. Use of the term “or” is not intended to be exclusive, unless the
context clearly requires otherwise. 
  

	 	3.	 ADMINISTRATION. 

3.1 Administration by the Board. The Plan shall be administered by the Board. All questions of interpretation of the Plan or of any
Award shall be determined by the Board, and such determinations shall be final and binding upon all persons having an interest in the Plan or such Award. 

3.2 Authority of Officers. Any Officer shall have the authority to act on behalf of the Company with respect to any matter, right,
obligation, determination or election which is the responsibility of or which is allocated to the Company herein, provided the Officer has apparent authority with respect to such matter, right, obligation, determination or election. 

3.3 Powers of the Board. In addition to any other powers set forth in the Plan and subject to the provisions of the Plan, the Board
shall have the full and final power and authority, in its discretion: 
 (a) to determine the persons to whom, and the time or times at
which; Awards shall be granted and the number of shares of Stock to be subject to each Award; 

(b) to designate Options as Incentive Stock Options or Nonstatutory Stock Options; 

(c) to determine the Fair Market Value of shares of Stock or other property; 

  
 5 

 (d) to determine the terms, conditions and restrictions applicable to each Award (which
need not be identical) and any shares acquired upon the exercise thereof, including, without limitation, (i) the exercise price of the Award, (ii) the method of payment for shares purchased upon the exercise of the Award, (iii) the
method for satisfaction of any tax withholding obligation arising in connection with the Award or such shares, including by the withholding or delivery of shares of stock, (iv) the timing, terms and conditions of the exercisability of the Award
or the vesting of any shares acquired upon the exercise thereof, (v) the time of the expiration of the Award, (vi) the effect of the Participant’s termination of Service on any of the foregoing, and (vii) all other terms,
conditions and restrictions applicable to the Award or such shares not inconsistent with the terms of the Plan; 
 (e) to approve one or
more forms of Award Agreement; 
 (f) to amend, modify, extend, cancel or renew any Award or to waive any restrictions or conditions
applicable to any Award or any shares acquired upon the exercise thereof; 
 (g) to accelerate, continue, extend or defer the exercisability
of any Award or the vesting of any shares acquired upon the exercise thereof, including with respect to the period following a Participant’s termination of Service; 

(h) to prescribe, amend or rescind rules, guidelines and policies relating to the Plan, or to adopt supplements to, or alternative versions
of, the Plan, including, without limitation, as the Board deems necessary or desirable to comply with the laws of, or to accommodate the tax policy or custom of, foreign jurisdictions whose citizens may be granted Awards; and 

(i) to correct any defect, supply any omission or reconcile any inconsistency in the Plan or any Award Agreement and to make all other
determinations and take such other actions with respect to the Plan or any Award as the Board may deem advisable to the extent not inconsistent with the provisions of the Plan or applicable law. 

3.4 Administration with Respect to Insiders. With respect to participation by Insiders in the Plan, at any time that any class of equity
security of the Company is registered pursuant to Section 12 of the Exchange Act, the Plan shall be administered in compliance with the requirements, if any, of Rule 16b-3. 

3.5 Indemnification. In addition to such other rights of indemnification as they may have as members of the Board or officers or
employees of the Participating Company Group, members of the Board and any officers or employees of the Participating Company Group to whom authority to act for the Board or the Company is delegated shall be indemnified by the Company against all
reasonable expenses, including attorneys’ fees, actually and necessarily incurred in connection with the defense of any action, suit or proceeding, or in connection with any appeal therein, to which they or any of them may be a party by reason
of any action taken or failure to act under or in connection with the Plan, or any right granted hereunder, and against all amounts paid by them in settlement thereof (provided such settlement is approved by independent legal counsel selected by the
Company) or paid by them in 

  
 6 

 
satisfaction of a judgment in any such action, suit or proceeding, except in relation to matters as to which it shall be adjudged in such action, suit or proceeding that such person is liable for
gross negligence, bad faith or intentional misconduct in duties; provided, however, that within sixty (60) days after the institution of such action, suit or proceeding, such person shall offer to the Company, in writing, the opportunity at its
own expense to handle and defend the same. 
  

	4.	 SHARES SUBJECT TO PLAN. 

4.1 Maximum Number of Shares Issuable. Subject to adjustment as provided in Section 4.2, the maximum aggregate number of shares of
Stock that may be issued under the Plan shall be two million (2,000,000) which shall consist of authorized but unissued or reacquired shares of Stock or any combination thereof. If an outstanding Award for any reason expires or is terminated or
canceled or if shares of Stock are acquired upon the exercise of an Award subject to a Company repurchase option and are repurchased by the Company at the Participant’s exercise or purchase price, the shares of Stock allocable to the
unexercised portion of such Award or such repurchased shares of Stock shall again be available for issuance under the Plan. Notwithstanding the foregoing, at any such time as the offer and sale of securities pursuant to the Plan is subject to
compliance with Section 260.140.45 of Title 10 of the California Code of Regulations (“Section 260,140.45”), the total number of shares of Stock issuable upon the exercise of all outstanding Awards (together with options
outstanding under any other stock plan of the Company) and the total number of shares provided for under any stock bonus or similar plan of the Company shall not exceed thirty percent (30%) (or such other higher percentage limitation as may be
approved by the shareholders of the Company pursuant to Section 260.140.45) of the then outstanding shares of the Company as calculated in accordance with the conditions and exclusions of Section 260.140.45. 

4.2 Adjustments for Changes in Capital Structure. Subject to any required action by the shareholders of the Company, in the event of any
change in the Stock effected without receipt of consideration by the Company, whether through merger, consolidation, reorganization, reincorporation, recapitalization, reclassification, stock dividend, stock split, reverse stock split, split-up, split-off, spin-off, combination of shares, exchange of shares, or similar change in the capital structure of the Company, or
in the event of payment of a dividend or distribution to the shareholders of the Company in a form other than Stock (excepting normal cash dividends) that has a material effect on the Fair Market Value of shares of Stock, appropriate and
proportionate adjustments shall be made in the number and class of shares subject to the Plan and to any outstanding Awards, in the ISO Share Limit set forth in Section 5.3(a), and in the exercise or purchase price per share of any outstanding
Awards in order to prevent dilution or enlargement of Participants’ rights under the Plan. For purposes of the foregoing, conversion of any convertible securities of the Company shall not be treated as “effected without receipt of
consideration by the Company.” If a majority of the shares which are of the same class as the shares that are subject to outstanding Awards are exchanged for, converted into, or otherwise become (whether or not pursuant to an Ownership Change
Event) shares of another corporation (the “New Shares”), the Committee may unilaterally amend the outstanding Awards to provide that such Awards are for New Shares. In the event of any such amendment, the number of shares subject
to, and the exercise or purchase price per share of, the outstanding Awards shall be adjusted in a fair and equitable manner as determined by the Committee, in its discretion. Any fractional share resulting from an adjustment pursuant to this 

  
 7 

 
Section 4.2 shall be rounded down to the nearest whole number, and the exercise price per share shall be rounded up to the nearest whole cent. In no event may the exercise price of any Award
be decreased to an amount less than the par value, if any, of the stock subject to the Award. Such adjustments shall be determined by the Board, and its determination shall be final, binding and conclusive. 

 

	 	5.	 ELIGIBILITY AND OPTION LIMITATIONS. 

5.1 Persons Eligible for Awards. Awards may be granted only to Employees, Consultants and Directors. 

5.2 Participation in Plan. Awards are granted solely at the discretion of the Board. Eligible persons may be granted more than one
Award. However, eligibility in accordance with this Section shall not entitle any person to be granted an Award, or, having been granted an Award, to be granted an additional Award. 

5.3 Incentive Stock Option Limitations. 

(a) Maximum Number of Shares Issuable Pursuant to Incentive Stock Options. Subject to Section 4.1 and adjustment as
provided in Section 4.2, the maximum aggregate number of shares of Stock that may be issued under the Plan pursuant to the exercise of Incentive Stock Options shall not exceed two million (2,000,000) shares (the “ISO Share
Limit”). The maximum aggregate number of shares of Stock that may be issued under the Plan pursuant to all Awards other than Incentive Stock Options shall be the number of shares determined in accordance with Section 4.1, subject
to adjustment as provided in Section 4.2. 
 (b) Persons Eligible. An Incentive Stock Option may be granted only to a
person who, on the effective date of grant, is an Employee. Any person who is not an Employee on the effective date of the grant of an Option to such person may be granted only a Nonstatutory Stock Option. An Incentive Stock Option granted to a
prospective Employee upon the condition that such person become an Employee shall be deemed granted effective on the date such person commences Service as an Employee, with an exercise price determined as of such date in accordance with
Section 6.1. 
 (c) Fair Market Value Limitation. To the extent that options designated as Incentive Stock Options
(granted under all stock plans of the Participating Company Group, including the Plan) become exercisable by a Participant for the first time during any calendar year for stock having a Fair Market Value greater than One Hundred Thousand Dollars
($100,000), the portions of such options which exceed such amount shall be treated as Nonstatutory Stock Options. For purposes of this Section 5.3, options designated as Incentive Stock Options shall be taken into account in the order in which
they were granted, and the Fair Market Value of stock shall be determined as of the time the option with respect to such stock is granted. If the Code is amended to provide for a different limitation from that set forth in this Section, such
different limitation shall be deemed incorporated herein effective as of the date and with respect to such Options as required or permitted by such amendment to the Code. If an Option is treated as an Incentive Stock Option in part and as a
Nonstatutory Stock Option in part by reason of the limitation set forth in this Section, the Participant may designate which portion of such Option the Participant is exercising. In the absence of such designation, the Participant shall be deemed to
have exercised the Incentive Stock Option portion of the Option first. Separate certificates representing each such portion shall be issued upon the exercise of the Option. 

  
 8 

	 	6.	 TERMS AND CONDITIONS OF OPTIONS. 

Options shall be evidenced by Award Agreements specifying the number of shares of Stock covered thereby, in such form as the Board shall from
time to time establish. Award Agreements may incorporate all or any of the terms of the Plan by reference and shall comply with and be subject to the following terms and conditions: 

6.1 Exercise Price. The exercise price for each Option shall be established in the discretion of the Board; provided, however, that, to
the extent required by applicable law, (a) the exercise price per share for an Option shall be not less than the Fair Market Value of a share of Stock on the effective date of grant of the Option and (b) no Option granted to a Ten Percent
Shareholder shall have an exercise price per share less than one hundred ten percent (110%) of the Fair Market Value of a share of Stock on the effective date of grant of the Option. Notwithstanding the foregoing, an Option (whether an Incentive
Stock Option or a Nonstatutory Stock Option) may be granted with an exercise price lower than the minimum exercise price set forth above if such Option is granted pursuant to an assumption or substitution for another option in a manner qualifying
under the provisions of Section 424(a) of the Code. 
 6.2 Exercisability and Term of Options. Options shall be exercisable at
such time or times, or upon such event or events, and subject to such terms, conditions, performance criteria and restrictions as shall be determined by the Board and set forth in the Award Agreement evidencing such Option; provided, however, that,
to the extent required by applicable law, (a) no Option shall be exercisable after the expiration of ten (10) years after the effective date of grant of such Option, (b) no Incentive Stock Option granted to a Ten Percent Shareholder
shall be exercisable after the expiration of five (5) years after the effective date of grant of such Option, and (c) with the exception of an Option granted to an Officer, a Director or a Consultant, no Option shall become exercisable at
a rate less than twenty percent (20%) per year over a period of five (5) years from the effective date of grant of such Option, subject to the Participant’s continued Service. Subject to the foregoing, unless otherwise specified by the
Board in the grant of an Option, any Option granted hereunder shall terminate ten (10) years after the effective date of grant of the Option, unless earlier terminated in accordance with its provisions. 

6.3 Payment of Exercise Price. 

(a) Forms of Consideration Authorized. Except as otherwise provided below, payment of the exercise price for the number
of shares of Stock being purchased pursuant to any Option shall be made (i) in cash or by check or cash equivalent, (ii) by tender to the Company, or attestation to the ownership, of shares of Stock owned by the Participant having a Fair
Market Value not less than the exercise price, (iii) by delivery of a properly executed notice together with irrevocable instructions to a broker providing for the assignment to the Company of the proceeds of a sale or loan with respect to some
or all of the shares being 

  
 9 

 
acquired upon the exercise of the Option (including, without limitation, through an exercise complying with the provisions of Regulation T as promulgated from time to time by the Board of
Governors of the Federal Reserve System) (a “Cashless Exercise”), (iv) by such other consideration as may be approved by the Board from time to time to the extent permitted by applicable law, or (v) by any combination thereof.
The Board may at any time or from time to time, by approval of or by amendment to the standard forms of Award Agreement described in Section 8, or by other means, grant Options which do not permit all of the foregoing forms of consideration to
be used in payment of the exercise price or which otherwise restrict one or more forms of consideration. 
 (b) Limitations on Forms
of Consideration. 
 (i) Tender of Stock. Notwithstanding the foregoing, an Option may not be exercised by tender to
the Company, or attestation to the ownership, of shares of Stock to the extent such tender or attestation would constitute a violation of the provisions of any law, regulation or agreement restricting the redemption of the Company’s stock.
Unless otherwise provided by the Board, an Option may not be exercised by tender to the Company, or attestation to the ownership, of shares of Stock unless such shares either have been owned by the Participant for more than six (6) months (and
were not used for another Option exercise by attestation during such period) or were not acquired, directly or indirectly, from the Company. 

(ii) Cashless Exercise. The Company reserves, at any and all times, the right, in the Company’s sole and absolute discretion, to
establish, decline to approve or terminate any program or procedures for the exercise of Options by means of a Cashless Exercise. 
 6.4
Effect of Termination of Service. 
 (a) Option Exercisability. Subject to earlier termination of the Option as
otherwise provided by this Plan and unless a longer exercise period is provided by the Board in the grant of an Option and set forth in the Award Agreement, an Option shall terminate immediately upon the Participant’s termination of Service to
the extent that it is then unvested and shall be exercisable after the Participant’s termination of Service to the extent it is then vested only during the applicable time period determined in accordance with this Section and thereafter shall
terminate: 
 (i) Disability. If the Participant’s Service terminates because of the Disability of the Participant, the
Option, to the extent unexercised and exercisable on the date on which the Participant’s Service terminated, may be exercised by the Participant (or the Participant’s guardian or legal representative) at any time prior to the expiration of
twelve (12) months after the date on which the Participant’s Service terminated (to the extent required by applicable law (or such other legal period of time as determined by the Board in its discretion)), but in any event no later than
the date of expiration of the Option’s term as set forth in the Award Agreement evidencing such Option (the “Option Expiration Date-) 

  
 10 

 (ii) Death. If the Participant’s Service terminates because of the death
of the Participant, the Option, to the extent unexercised and exercisable on the date on which the Participant’s Service terminated, may be exercised by the Participant’s legal representative or other person who acquired the right to
exercise the Option by reason of the Participant’s death at any time prior to the expiration of twelve (12) months after the date on which the Participant’s Service terminated (to the extent required by applicable law (or such other
legal period of time as determined by the Board in its discretion)), but in any event no later than the Option Expiration Date. The Participant’s Service shall be deemed to have terminated on account of death if the Participant dies within
three (3) months (or such longer period of time as determined by the Board, in its discretion) after the Participant’s termination of Service. 

(iii) Other Termination of Service. If the Participant’s Service terminates for any reason, except Disability or death, the
Option, to the extent unexercised and exercisable by the Participant on the date on which the Participant’s Service terminated, may be exercised by the Participant at any time prior to the expiration of ninety (90) days after the date on
which the Participant’s Service terminated (to the extent required by applicable law (or such other legal period of time as determined by the Board in its discretion)), but in any event no later than the Option Expiration Date. 

(b) Extension if Exercise Prevented by Law. Notwithstanding the foregoing, if the exercise of an Option within the
applicable time periods set forth in Section 6.4(a) is prevented by the provisions of Section 11 below, the Option shall remain exercisable until thirty (30) days after the date such exercise first would no longer be prevented by such
provisions (to the extent required by applicable law (or such other legal period of time as determined by the Board in its discretion)), but in any event no later than the Option Expiration Date. 

6.5 Transferability of Options. To the extent required by applicable law, during the lifetime of the Participant, an Option shall be
exercisable only by the Participant or the Participant’s guardian or legal representative. No Option shall be assignable or transferable by the Participant, except by will or by the laws of descent and distribution. Notwithstanding the
foregoing, to the extent permitted by the Board, in its discretion, and set forth in the Award Agreement evidencing such Option, a Nonstatutory Stock Option shall be assignable or transferable subject to the applicable limitations, if any, described
in Section 260.140.41 of Title 10 of the California Code of Regulations, Rule 701 under the Securities Act, and the General Instructions to Form S-8 Registration Statement under the Securities Act. 

 

	 	7.	 TERMS AND CONDITIONS OF STOCK PURCHASE RIGHTS. 

Stock Purchase Rights shall be evidenced by Award Agreements, specifying the number of shares of Stock covered thereby, in such form as the
Board shall from time to time establish. Award Agreements may incorporate all or any of the terms of the Plan by reference and shall comply with and be subject to the following terms and conditions: 

7. I Purchase Price. The purchase price under each Stock Purchase Right shall be established by the Board; provided, however, that, to
the extent required by applicable law, (a) the purchase price per share shall be at least eighty-five percent (85%) of the Fair Market Value of a share of Stock either on the effective date of grant of the Stock Purchase Right or on the date on
which the purchase is consummated and (b) the purchase price per share under a Stock Purchase Right granted to a Ten Percent Shareholder shall be at least one hundred percent (100%) of the Fair Market Value of a share of Stock either on the
effective date of grant of the Stock Purchase Right or on the date on which the purchase is consummated. 

  
 11 

 7.2 Purchase Period. A Stock Purchase Right shall be exercisable within a period
established by the Board, which shall in no event exceed thirty (30) days from the effective date of the grant of the Stock Purchase Right. 

7.3 Payment of Purchase Price. Except as otherwise provided below, payment of the purchase price for the number of shares of Stock being
purchased pursuant to any Stock Purchase Right shall be made (a) in cash or by check or cash equivalent, (b) in the form of the Participant’s past service rendered to a Participating Company or for its benefit having a value not less
than the aggregate purchase price of the shares being acquired, (c) by such other consideration as may be approved by the Board from time to time to the extent permitted by applicable law, or (d) by any combination thereof. The Board may
at any time or from time to time, by adoption of or by amendment to the standard form of Award Agreement described in Section 8, or by other means, grant Stock Purchase Rights which do not permit all of the foregoing forms of consideration to
be used in payment of the purchase price or which otherwise restrict one or more forms of consideration. 
 7.4 Vesting and Restrictions
on Transfer. Shares issued pursuant to any Stock Purchase Right may or may not be made subject to vesting conditioned upon the satisfaction of such Service requirements, conditions, restrictions or performance criteria (the “Vesting
Conditions”) as shall be established by the Board and set forth in the Award Agreement evidencing such Award. During any period (the “Restriction Period”) in which shares acquired pursuant to a Stock Purchase Right
remain subject to Vesting Conditions, such shares may not be sold, exchanged, transferred, pledged, assigned or otherwise disposed of other than pursuant to an Ownership Change Event or as provided in Section 7.5. Upon request by the Company,.
each Participant shall execute any agreement evidencing such transfer restrictions prior to the receipt of shares of Stock hereunder and shall promptly present to the Company any and all certificates representing shares of Stock acquired hereunder
for the placement on such certificates of appropriate legends evidencing any such transfer restrictions. 
 7.5 Effect of Termination of
Service. Unless otherwise provided by the Board in the grant of a Stock Purchase Right and set forth in the Award Agreement, if a Participant’s Service terminates for any reason, whether voluntary or involuntary (including the
Participant’s death or disability), then the Company shall have the option to repurchase for the purchase price paid by the Participant any shares acquired by the Participant pursuant to a Stock Purchase Right which remain subject to Vesting
Conditions as of the date of the Participant’s termination of Service; provided, however, that with the exception of shares acquired pursuant to a Stock Purchase Right by an Officer, a Director or a Consultant, the Company’s repurchase
option must lapse, to the extent required by applicable law, at the rate of at least twenty percent (20%) of the shares per year over the period of five (5) years from the effective date of grant of the Stock Purchase Right (without regard to
the date on which the Stock Purchase Right was exercised) and the repurchase option must be exercised, if at all, for cash or cancellation of purchase money indebtedness for the shares within ninety (90) days following the Participant’s
termination of Service. The Company shall have the right to assign at any time any repurchase right it may have, whether or not such right is then exercisable, to one or more persons as may be selected by the Company. 

  
 12 

 7.6 Nontransferability of Stock Purchase Rights. To the extent required by applicable
law, rights to acquire shares of Stock pursuant to a Stock Purchase Right may not be assigned or transferred in any manner except by will or the laws of descent and distribution, and, during the lifetime of the Participant, shall be exercisable only
by the Participant. 
  

	 	8.	 STANDARD FORMS OF AWARD AGREEMENTS. 

8.1 Award Agreements. Each Award shall comply with and be subject to the terms and conditions set forth in the appropriate form of Award
Agreement approved by the Board and as amended from time to time. No Award or purported Award shall be a valid and binding obligation of the Company unless evidenced by a fully executed Award Agreement. Any Award Agreement may consist of an
appropriate form of Notice of Grant and a form of Agreement incorporated therein by reference, or such other form or forms, including electronic media, as the Committee may approve from time to time. 

8.2 Authority to Vary Terms. The Board shall have the authority from time to time to vary the terms of any standard form of Award
Agreement either in connection with the grant or amendment of an individual Award or in connection with the authorization of a new standard form or forms; provided, however, that the terms and conditions of any such new, revised or amended standard
form or forms of Award Agreement are not inconsistent with the terms of the Plan. 
  

	 	9.	 CHANGE IN CONTROL. 

9.1 Effect of Change in Control on Awards. 

(a) Accelerated Vesting. The Board may, in its sole discretion, provide in any Award Agreement or, in the event of
a Change in Control, may take such actions as it deems appropriate to provide for the acceleration of the exercisability and vesting in connection with such Change in Control of any or all outstanding Awards and shares acquired upon the exercise
thereof upon such conditions, including termination of the Participant’s Service prior to, upon, or following such Change in Control, and to such extent as the Board shall determine. 

(b) Assumption or Substitution of Awards. In the event of a Change in Control, the surviving, continuing,
successor, or purchasing corporation or other business entity or parent thereof, as the case may be (the “Acquiror”), may, without the consent of any Participant, either assume or continue the Company’s rights and
obligations under each or any Award or portion thereof outstanding immediately prior to the Change in Control or substitute for each or any such outstanding Award or portion thereof a substantially equivalent award for the Acquiror’s stock. For
purposes of this Section, an Award shall be deemed assumed if, following the Change in Control, the Award confers the right to receive, subject to the terms and conditions of the Plan and the applicable Award Agreement, for each share of Stock
subject to the Award immediately prior to the Change in Control, the consideration (whether stock, cash, other securities or property or a combination thereof) to which a holder Of a share of Stock on the 

  
 13 

 
effective date of the Change in Control was entitled; provided, however, that if such consideration is not solely common stock of the Acquiror, the Board may, with the consent of the Acquiror,
provide for the consideration to be received upon the exercise of the Award, for each share of Stock subject to the Award, to consist solely of common stock of the Acquiror equal in Fair Market Value to the per share consideration received by
holders of Stock pursuant to the Change in Control. Any Award or portions thereof which are neither assumed or continued by the Acquiror in connection with the Change in Control nor exercised as of the time of consummation of the Change in Control
shall terminate and cease to be outstanding effective as of the time of consummation of the Change in Control. Notwithstanding the foregoing, shares acquired upon exercise of an Award prior to the Change in Control and any consideration received
pursuant to the Change in Control with respect to such shares shall continue to be subject to all applicable provisions of the Award Agreement evidencing such Award except as otherwise provided in such Award Agreement. 

(c) Cash-Out of Awards. The Board may, in its sole discretion and without
the consent of any Participant, determine that, upon the occurrence of a Change in Control, each or any Award outstanding immediately prior to the Change in Control shall be canceled in exchange for a payment with respect to each vested share (and
each unvested share, if so determined by the Board) of Stock subject to such canceled Award in (i) cash, (ii) stock of the Company or of a corporation or other business entity a party to the Change in Control, or (iii) other property
which, in any such case, shall be in an amount having a Fair Market Value equal to the Fair Market Value of the consideration to be paid per share of Stock in the Change in Control over the exercise price per share under such Award (the
“Spread”). In the event such determination is made by the Board, the Spread (reduced by applicable withholding taxes, if any) shall be paid to Participants in respect of their canceled Awards as soon as practicable following
the date of the Change in Control and in respect of the unvested portion of their canceled Awards in accordance with the vesting schedule applicable to such Awards as in effect prior to the Change in Control. 

9.2 Federal Excise Tax Under Section 4999 of the Code. 

(a) Excess Parachute Payment. In the event that any acceleration of vesting pursuant to an Award and any other
payment or benefit received or to be received by a Participant would subject the Participant to any excise tax pursuant to Section 4999 of the Code due to the characterization of such acceleration of vesting, payment or benefit as an
“excess parachute payment” under Section 280G of the Code, the Participant may elect, in his or her sole discretion, to reduce the amount of any acceleration of vesting called for under the Award in order to avoid such
characterization. 
 (b) Determination by Independent Accountants. To aid the Participant in making any election
called for under Section 9.2(a), no later than the date of the occurrence of any event that might reasonably be anticipated to result in an “excess parachute payment” to the Participant as described in Section 9.2(a), the Company
shall request a determination in writing by independent public accountants selected by the Company (the “Accountants”). As soon as practicable thereafter, the Accountants shall determine and report to the Company and the
Participant the amount of such acceleration of vesting, payments and benefits which would produce the greatest after-tax benefit to the Participant. For the purposes 

  
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of such determination, the Accountants may rely on reasonable, good faith interpretations concerning the application of Sections 280G and 4999 of the Code. The Company and the Participant shall
furnish to the Accountants such information and documents as the Accountants may reasonably request in order to make their required determination. The Company shall bear all fees and expenses the Accountants may reasonably charge in connection with
their services contemplated by this Section 9.2(b). 
  

	 	10.	 TAX WITHHOLDING. 

10.1 Tax Withholding in General. The Company shall have the right to deduct from any and all payments made under the Plan, or to
require the Participant, through payroll withholding, cash payment or otherwise, including by means of a Cashless Exercise of an Option, to make adequate provision for, the federal, state, local and foreign taxes, if any, required by law to be
withheld by the Participating Company Group with respect to an Award or the shares acquired pursuant thereto. The Company shall have no obligation to deliver shares of Stock or to release shares of Stock from an escrow established pursuant to an
Award Agreement until the Participating Company Group’s tax withholding obligations have been satisfied by the Participant. 
 10.2
Withholding in Shares. The Company shall have the right, but not the obligation, to deduct from the shares of Stock issuable to a Participant upon the exercise of an Award, or to accept from the Participant the tender of, a number of whole
shares of Stock having a Fair Market Value, as determined by the Company, equal to all or any part of the tax withholding obligations of the Participating Company Group. The Fair Market Value of any shares of Stock withheld or tendered to satisfy
any such tax withholding obligations shall not exceed the amount determined by the applicable minimum statutory withholding rates. 
  

	 	11.	 COMPLIANCE WITH SECURITIES LAW. 

The grant of Awards and the issuance of shares of Stock upon exercise of Awards shall be subject to compliance with all applicable requirements
of federal, state and foreign law with respect to such securities. Awards may not be exercised if the issuance of shares of Stock upon exercise would constitute a violation of any applicable federal, state or foreign securities laws or other law or
regulations or the requirements of any stock exchange or market system upon which the Stock may then be listed. In addition, no Award may be exercised unless (a) a registration statement under the Securities Act shall at the time of exercise of
the Award be in effect with respect to the shares issuable upon exercise of the Award or (b) in the opinion of legal counsel to the Company, the shares issuable upon exercise of the Award may be issued in accordance with the terms of an
applicable exemption from the registration requirements of the Securities Act. The inability of the Company to obtain from any regulatory body having jurisdiction the authority. if any, deemed by the Company’s legal counsel to be
necessary’ to the lawful issuance and sale of any shares hereunder shall relieve the Company of any liability in respect of the failure to issue or sell such shares as to which such requisite authority shall not have been obtained. As a
condition to the exercise of any Award, the Company may require the Participant to satisfy any qualifications that may be necessary or appropriate, to evidence compliance with any applicable law or regulation and to make any representation or
warranty with respect thereto as may be requested by the Company. 

  
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	 	12.	 AMENDMENT OR TERMINATION OF PLAN. 

The Board may amend, suspend or terminate the Plan at any time. However, subject to changes in applicable law, regulations or rules that would
permit otherwise, without the approval of the Company’s shareholders, there shall be (a) no increase in the maximum aggregate number of shares of Stock that may be issued under the Plan (except by operation of the provisions of
Section 4.2), (b) no change in the class of persons eligible to receive Incentive Stock Options, and (c) no other amendment of the Plan that would require approval of the Company’s shareholders under any applicable law, regulation or
rule, including the rules of any stock exchange or market system upon which the Stock may then be listed. No amendment, suspension or termination of the Plan shall affect any then outstanding Award unless expressly provided by the Board. Except as
provided by the next sentence, no amendment, suspension or termination of the Plan may adversely affect any then outstanding Award without the consent of the Participant. Notwithstanding any other provision of the Plan or any Award Agreement to the
contrary, the Board may, in its sole and absolute discretion and without the consent of any Participant, amend the Plan or any Award Agreement, to take effect retroactively or otherwise, as it deems necessary or advisable for the purpose of
conforming the Plan or such Award Agreement to any present or future law, regulation or rule applicable to the Plan, including, but not limited to, Section 409A of the Code and all applicable guidance promulgated thereunder. 

 

	 	13.	 MISCELLANEOUS PROVISIONS. 

13.1 Repurchase Rights. Shares issued under the Plan may be subject to a right of first refusal, one or more repurchase options, or
other conditions and restrictions as determined by the Board in its discretion at the time the Award is granted. The Company shall have the right to assign at any time any repurchase right it may have, whether or not such right is then exercisable,
to one or more persons as may be selected by the Company. Upon request by the Company, each Participant shall execute any agreement evidencing such transfer restrictions prior to the receipt of shares of Stock hereunder and shall promptly present to
the Company any and all certificates representing shares of Stock acquired hereunder for the placement on such certificates of appropriate legends evidencing any such transfer restrictions. 

13.2 Provision of Information. To the extent required by applicable law, at least annually, copies of the Company’s balance sheet
and income statement for the just completed fiscal year shall be made available to each Participant and purchaser of shares of Stock upon the exercise of an Award. The Company shall not be required to provide such information to key employees whose
duties in connection with the Company assure them access to equivalent information. Furthermore, to the extent required by applicable law, the Company shall deliver to each Participant such disclosures as are required in accordance with Rule 701
under the Securities Act. 
 13.3 Rights as Employee, Consultant or Director. No person, even though eligible pursuant to
Section 5, shall have a right to be selected as a Participant, or, having been so selected to be selected again as a Participant. Nothing in the Plan or any Award granted under the Plan shall confer on any Participant a right to remain an
Employee, Consultant or Director or interfere with or limit in any way any right of a Participating Company to terminate the Participant’s Service at any time. To the extent that an Employee of a Participating Company other than the Company
receives an Award under the Plan, that Award shall in no event be understood or interpreted to mean that the Company is the Employee’s employer or that the Employee has an employment relationship with the Company. 

  
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 13.4 Rights as a Shareholder. A Participant shall have no rights as a shareholder
with respect to any shares covered by an Award until the date of the issuance of such shares (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company). No adjustment shall be made for
dividends, distributions or other rights for which the record date is prior to the date such shares are issued, except as provided in Section 4.2 or another provision of the Plan. 

13.5 Fractional Shares. The Company shall not be required to issue fractional shares upon the exercise or settlement of any Award. 

13.6 Retirement and Welfare Plans. Neither Awards made under this Plan nor shares of Stock or cash paid pursuant to such Awards shall be
included as “compensation” for purposes of computing the benefits payable to any Participant under any Participating Company’s retirement plans (both qualified and non-qualified) or welfare
benefit plans unless such other plan expressly provides that such compensation shall be taken into account in computing such benefits. 

13.7 Severability. If any one or more of the provisions (or any part thereof) of this Plan shall be held invalid, illegal or
unenforceable in any respect, such provision shall be modified so as to make it valid, legal and enforceable, and the validity, legality and enforceability of the remaining provisions (or any part thereof) of the Plan shall not in any way be
affected or impaired thereby. 
 13.8 No Constraint on Corporate Action. Nothing in this Plan shall be construed to: (a) limit,
impair, or otherwise affect the Company’s or another Participating Company’s right or power to make adjustments, reclassifications, reorganizations, or changes of its capital or business structure, or to merge or consolidate, or dissolve,
liquidate, sell, or transfer all or any part of its business or assets; or (b) limit the right or power of the Company or another Participating Company to take any action which such entity deems to be necessary or appropriate. 

13.9 Choice of Law. Except to the extent governed by applicable federal law, the validity, interpretation, construction and performance
of the Plan and each Award Agreement shall be governed by the laws of the State of California, without regard to its conflict of law rules. 

13.10 Shareholder Approval. To the extent required by applicable law, the Plan or any increase in the maximum aggregate number of shares
of Stock issuable thereunder as provided in Section 4.1 (the “Authorized Shares”) shall be approved by a majority of the outstanding securities of the Company entitled to vote within twelve (12) months before
or after the date of adoption thereof by the Board. Awards granted prior to security holder approval of the Plan or in excess of the Authorized Shares previously approved by the security holders shall become exercisable no earlier than the date of
security holder approval of the Plan or such increase in the Authorized Shares, as the case may be. 

  
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 PLAN HISTORY 

November 28, 2007 Board adopts Plan, with an initial reserve of 2,000,000 shares. 

November 28, 2007 Shareholders of the Company approve Plan

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