Specimen Common Stock Certificate



 Exhibit 4.1 

			
	 Common Stock
 Number
	  	 Common Stock
 Shares


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

					
		 		 	 SEE REVERSE SIDE FOR CERTAIN
 DEFINITIONS
 CUSIP 87612C 100


 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 Corporation by the holder hereof, in person, or by duly authorized attorney upon surrender of this Certificate properly endorsed. 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. 
  

			
		  	
	PRESIDENT AND CHIEF EXECUTIVE OFFICER	  	 TREASURER


 Countersigned and Registered: 
 CONTINENTAL STOCK TRANSFER & TRUST COMPANY 
                             Transfer Agent and Registrar 
  

			
	By:	 	 
		 	Authorized Officer

  

  








 TARGANTA THERAPEUTICS CORPORATION 
 The Corporation will 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. 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: 
  

													
	 TEN COM — as tenants in common
 TEN ENT — as
tenants by the entireties
	  	UNIF GIFT MIN ACT — 	  	 _______
 (Cust)
	  		  	Custodian	  	 _________________________________
 (Minor)            

			
	JT TEN — as joint tenants with right of survivorship and not as tenants in common	  		  	 Under Uniform Gifts to Minors Act
  

	COM PROP — as community property	  		  	(State)
					
		  	UNIF TRF MIN ACT —	  	 	  		  	Custodian (until age         )
		  		  	(Cust)	  		  		  		    	
		  		  	 	  		  	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, 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 Corporation with full power of substitution in the premises. 
  

					
	Dated _________________________	  	X	  	___________________________
			
		  	X	  	___________________________
	Signature(s) Guaranteed	  		  	 The signature(s) to this assignment must correspond with the name(s) written upon the face of the certificate in every particular, without
alteration or enlargement or any change whatever.

	 By _____________________________
 The signatures must be
guaranteed by an eligible guarantor institution (banks, stockbrokers, savings and loan associations and credit unions with membership in an approved signature guarantor medallion program) pursuant to S.E.C. Rule 17Ad-15.