Specimen of Common Stock Certificate



 Exhibit 4.1 
 COMMON STOCK 
  

			
	Number	  	Shares

 TARGANTA THERAPEUTICS CORPORATION 
 INCORPORATED UNDER THE LAWS 
 OF THE STATE OF DELAWARE 
  

					
		 		 	 CUSIP 87612C 100
 SEE REVERSE SIDE FOR CERTAIN
 DEFINITIONS


 THIS CERTIFIES THAT 
 IS THE OWNER OF 
 FULLY-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK, PAR VALUE OF $0.0001 PER SHARE OF TARGANTA THERAPEUTICS
CORPORATION transferable on the books of the Company by the holder hereof, in person, or by duly authorized attorney upon surrender of this Certificate properly endorsed. The shares represented by this Certificate are subject to the provisions
of the certificate of incorporation and by-laws of the Company as from time to time amended or restated. This Certificate is not valid until countersigned by the Transfer Agent and registered by the Registrar. 
 Witness the facsimile signatures of its duly authorized officers. 
  

			
	 CHAIRMAN OR VICE CHAIRMAN
 OR PRESIDENT OR VICE PRESIDENT
	  	
		  	 SECRETARY OR ASSISTANT SECRETARY
 OR TREASURER OR ASSISTANT TREASURER


 Countersigned and Registered: 
 CONTINENTAL STOCK TRANSFER & TRUST COMPANY 
  

			
	By:	 	 
		 	Transfer Agent and Registrar
		 	Authorized Signature

  

  








 TARGANTA THERAPEUTICS CORPORATION 
 THE RECORD HOLDER OF THIS CERTIFICATE MAY OBTAIN FROM THE SECRETARY OF THE COMPANY, UPON REQUEST AND WITHOUT CHARGE, A FULL STATEMENT OF THE DESIGNATION, RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF THE SHARES OF
EACH CLASS AUTHORIZED TO BE ISSUED AND THE DESIGNATION, RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF EACH SERIES OF PREFERRED SHARES AUTHORIZED TO BE ISSUED SO FAR AS THE SAME HAVE BEEN FIXED AND THE AUTHORITY OF THE BOARD OF DIRECTORS TO
DESIGNATE AND FIX THE RELATIVE RIGHTS, PREFERENCES AND LIMITATIONS OF OTHER SERIES. 
 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: 
  

														
	 TEN COM — as tenants in common
 TEN ENT — as
tenants by the entireties
	  	UNIF GIFT MIN ACT —	  	 	  		  	Custodian	  		    	 	 
		  		  	(Custodian)	  		  		  		    	(Minor	)
							
	JT TEN — as joint tenants with right of survivorship and not as tenants in common	  		  		  		  		  		    		

  

	
	Under Uniform Gifts 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, INCLUDING ZIP CODE OF ASSIGNEE) 
                                       
                                        
                                        
                                        
                                        
                                        
                    
                                       
                                        
                                        
                                        
                                        
                                        
                    
                                       
                                        
                                        
                                        
                                        
                                        
                    
 ____________________________________________________________ shares 
 of the 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 Company with full power of substitution in the premises. 
  

					
	Dated _________________________	  	X	  	___________________________
			
		  	X	  	___________________________









			
		  	NOTICE: THE SIGNATURE ON THIS ASSIGNMENT MUST CORRESPOND EXACTLY WITH THE NAME WRITTEN UPON THE FACE OF THE CERTIFICATE.
	 Signature(s) Guaranteed:
	  	
		
	 	  	
	THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION, AS DEFINED IN RULE 17AD-15 UNDER THE SECURITIES AND EXCHANGE ACT OF 1934, AS AMENDED	  	

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