Document:

Form of Incentive Stock Option Award

 Exhibit 10.3 
 GTC BIOTHERAPEUTICS, INC. 2002 EQUITY INCENTIVE PLAN 
 Form of Incentive Stock Option Terms And Conditions 
  
 1. Plan Incorporated by
Reference. This Option is issued pursuant to the terms of the Plan and may be amended as provided in the Plan. Capitalized terms used and not otherwise defined in this Option Agreement have the meanings given to them in the Plan. This Option
Agreement does not set forth all of the terms and conditions of the Plan, which are incorporated herein by reference. The Committee administers the Plan and its determinations regarding the operation and interpretation of the Plan are final and
binding. Copies of the Plan may be obtained upon written request without charge from the Human Resources Department of the Company. 
 2.
Option Price. The price to be paid for each share of Common Stock issued upon exercise of the whole or any part of this Option is the option price set forth on the face of this Option Agreement. 
 3. Exercisability Schedule. This Option may be exercised at any time and from time to time up to the number of shares and in accordance with the
exercisability schedule set forth on the face of this Option Agreement, but only for the purchase of whole shares. This Option may not be exercised as to any shares after the Expiration Date. This Option may be terminated by the Company before the
Expiration Date as permitted herein or by the Plan. 
 4. Method of Exercise. To exercise this Option, the Optionholder shall deliver
written notice of exercise to the Company specifying the number of shares with respect to which the Option is being exercised accompanied by payment of the option price for such shares in cash, by certified check or in such other form, including
shares of Common Stock of the Company valued at their Fair Market Value on the date of delivery or a payment commitment of a financial or brokerage institution, as the Committee may at the time of exercise approve. Following such notice and payment,
the Company will deliver to the Optionholder a certificate representing the number of shares with respect to which the Option is being exercised. 
 5. Rights as an Optionholder or Stockholder. The Optionholder shall not earn the right to exercise or obtain the value of any portion of this Option except as provided in the exercisability schedule and until such time as all the
conditions set forth herein and in the Plan that are required to be met in order to exercise this Option have been fully satisfied. No portion of this Option shall be deemed compensation for past services before it has become exercisable in
accordance with the exercisability schedule. The Optionholder shall not have any rights in respect of shares as to which the Option shall not have been exercised and payment made as provided above. 
 6. No Right to Employment. Neither the adoption or operation of the Plan nor the grant of this Option confer upon the Optionholder any right to
continued employment by the Company or any Affiliate nor shall they interfere with the right of the Company or Affiliate to terminate the Optionholder at any time or otherwise to change the terms of the Optionholder’s employment. 
 7. Recapitalization, Mergers, Etc. As provided in the Plan, in the event of a merger, recapitalization or other corporate transaction involving the
Company, the Committee may in its discretion take certain actions affecting the Option and the Optionholder’s rights hereunder, including without limitation adjusting the number and kind of securities subject to the Option and the option price,
providing for another entity to assume the Option, providing for a cash payment in lieu of issuing shares, and terminating the Option. 
  

 8. Option Not Transferable. This Option is
not transferable by the Optionholder otherwise than by will or the laws of descent and distribution, and is exercisable, during the Optionholder’s lifetime, only by the Optionholder. The naming of a Designated Beneficiary does not constitute a
transfer. 
 9. Exercise of Option After Termination of Employment. If the Optionholder’s employment with (a) the Company,
(b) an Affiliate, or (c) a corporation (or parent or subsidiary corporation of such corporation) issuing or assuming a stock option in a transaction to which section 424(a) of the Code applies, is terminated for any reason other than by
disability (within the meaning of section 22(e)(3) of the Code) or death, the Optionholder may exercise only the rights that were exercisable by the Optionholder at the time of such termination and only within three months from the date of
termination. If Optionholder’s employment is terminated as a result of disability or death, such rights may be exercised (including by the Optionholder’s Designated Beneficiary after death) only within twelve months from the date of
termination. Notwithstanding the foregoing, no rights under this Option may be exercised after the Expiration Date. 
 10. Compliance with
Securities Laws. It shall be a condition to the Optionholder’s right to purchase shares of Common Stock hereunder that the Company may, in its discretion, require (a) that the shares of Common Stock reserved for issue upon the exercise
of this Option shall have been duly listed, upon official notice of issuance, upon any national securities exchange or automated quotation system on which the Company’s Common Stock may then be listed or quoted, (b) that either (i) a
registration statement under the Securities Act of 1933, as amended, with respect to the shares shall be in effect, or (ii) in the opinion of counsel for the Company, the proposed purchase shall be exempt from registration under that Act and
the Optionholder shall have made such undertakings and agreements with the Company as the Company may reasonably require, and (c) that such other steps, if any, as counsel for the Company shall consider necessary to comply with any law
applicable to the issue of such shares by the Company shall have been taken by the Company or the Optionholder, or both. The certificates representing the shares purchased under this Option may contain such legends as counsel for the Company shall
consider necessary to comply with any applicable law. 
 11. Optionholder’s Tax Treatment. This Option is intended to be treated as
an incentive stock option under section 422 of the Code. However, incentive stock option treatment requires compliance with a number of factors, and the Company gives no assurance that this Option will, in fact, be treated as an incentive stock
option. 
 12. Notice of Sale of Shares Required. The Optionholder agrees to notify the Company in writing within 30 days of the sale or
other disposition of any shares purchased upon exercise of this Option if such sale or other disposition occurs within two years of the date of the grant of this Option or within one year after such purchase.Specimen Stock Certificate.

 Exhibit 4.2 
  

													
		 	 COMMON STOCK
  
	  		  		  		 	 COMMON STOCK
  
	 	
		 	  
 Number
 ---
  
	  		  	CERUS	  		 	  
 Shares
 ***0***
  
	 	
			
	 INCORPORATED UNDER THE LAWS        

OF THE STATE OF DELAWARE        
	  		  	SEE REVERSE FOR CERTAIN DEFINITIONS AND A STATEMENT AS TO THE POWERS, DESIGNATIONS, PREFERENCES, RESTRICTIONS, AND RIGHTS OF SHARES

							
		 		  		  		  		 	CUSIP  157085  10  1	 	

  

							
	THIS CERTIFIES THAT	 		    	  
 SPECIMEN
  
	  	
				
		 		    		  	
	IS THE RECORD OWNER OF	 		    	  
 ZERO
  
	  	

 FULLY PAID AND NON-ASSESSABLE SHARES OF COMMON SHARES, $0.001 PAR VALUE OF 

----------------------CERUS CORPORATION---------------------- 
 transferable on the books of the Corporation by the registered holder hereof in person or by duly authorized attorney upon surrender of this certificate properly endorsed. This certificate is not valid
unless countersigned by the Transfer Agent and registered by the Registrar. 
 In Witness Whereof the Corporation has caused this certificate to
be signed in facsimile by it authorized officers and its facsimile seal to be affixed. 
  

									
	Dated	 		  		 		  	
		 	 		
	 /s/ Lori L. Roll
	 	 	  	CERUS CORPORATION	 		  	 /s/ Claes Glassell

	Secretary	 	 	  	 	 		  	President and
		 	 	  	 CORPORATE SEAL
  
	 		  	Chief Executive Officer
		 	 	  	 	 		  	

  

							
		 	  
 COUNTERSIGNED AND REGISTERED:
 WELLS FARGO BANK, N.A.

		 
		 	TRANSFER AGENT AND REGISTRAR,
		 
		 	               VOID
		 	By	  	  
	  	 
		 	 	  	 AUTHORIZED SIGNATURE
  
	  	 

 CERUS CORPORATION 
 The Corporation is authorized to issued Common Stock and Preferred Stock. The Board of Directors of the Company has the authority to fix the
number of shares and the designations of Preferred Stock and to determine or amend the preferences, privileges, and restrictions granted to or imposed upon any unissued shares of Preferred Stock. 
 The Corporation shall furnish without charge to each stockholder who so requests a statement of the powers, designations, preferences and
relative, participating, optional or other special rights of each class of stock of the Corporation or series thereof and the qualifications, limitations or restrictions of such preferences and/or rights so far as the same shall have been fixed, and
of the authority of the Board of Directors to designate and fix any preferences, rights and limitations of any wholly unissued series. Such requests shall be made to the Corporation’s Secretary at the principal office of the Corporation.

  

											
	  
 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

											
	 	 		 	UNIF GIFT MIN ACT –
                       Custodian
                            
	TEN COM	 	as tenants in common	 		 	(Cust)                          
(Minor)            
	 		 
	TEN ENT	 	as tenants by entireties	 	                            under Uniform Gifts to Minors Act
                                    
	 	 		 		 		 		 	(State)                    
	JT TEN	 	as joint tenants with right of	 	UNIF TRF MIN ACT –                      Custodian (until age    
           )
	 	 	survivorship and not as	 	(Cust)                                       
               
	 	 	tenants in common	 	                                 under Uniform Transfers

	 	 		 		 	(Minor)                  	 	 
	 	 		 		 	to Minors Act
                                        
          
	 	 		 		 		 	                (State)
	 Additional abbreviations may also be used though not in the above list.
  

 For value received,
                                         
                                         
                               hereby sell, assign and transfer unto 
 PLEASE INSERT SOCIAL SECURITY OR OTHER 
     IDENTIFYING NUMBER OF ASSIGNEE 
  

			
	 	
	 	  	

  
  
  
  
 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS OF ASSIGNEE) 
  
  
  
  
  

			
	 	 	Shares

  

			
	of the capital stock represented by the within Certificate, and do hereby irrevocably constitute and appoint	 	 

  

			
	 	 	Attorney to

 transfer the said stock on the books of the within named Corporation with full power of substitution.

 Dated:                     

  

					
		 	X	  	  

			
		 	X	  	  

		 	NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME(S) AS WRITTEN UPON THE FACE OF THE CERTIFICATE, IN EVERY PARTICULAR WITHOUT ALTERATION OR
ENLARGEMENT OR ANY CHANGE WHATSOEVER.

 
  

			
	SIGNATURE(S) GUARANTEED	  	  

		  	THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED
SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.

  

	
	This certificate also evidences and entitles the holder hereof to certain rights as set forth
in a Rights Agreement between Cerus Corporation (the “Company”) and Wells Fargo Bank, N.A. (as successor to Wells Fargo Bank Minnesota, N.A., formerly known as Norwest Bank Minnesota, N.A.) as Rights Agent (the “Rights Agent”),
dated as of November 3, 1999 and amended as of August 6, 2001, as further amended from time to time (the “Rights Agreement”), the terms of which are herby incorporated herein by reference and a copy of which is on file at the
principal executive offices of the Company. Under certain circumstances, as set forth in the Rights Agreement, such Rights will be evidenced by separate certificates and will no longer be evidenced by this certificate. The Company will mail to the
holder of this certificate a copy of the Rights Agreement without charge after receipt of a written request therefor. As described in the Rights Agreement, Rights issued to any person who becomes an Acquiring Person or an Affiliate or Associate
thereof (as defined in the Rights Agreement) and certain related persons, whether currently held by or on behalf of such Person or by any subsequent holder, shall become null and void.

 KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, OR DESTROYED, THE
CORPORATION MAY REQUIRE A BOND OF INDEMNITY AS A CONDITION TO THE ISSUANCE OF A REPLACEMENT CERTIFICATE

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