Form of Common Stock



 Exhibit 4.1 
 

 
  







 The Corporation will furnish without charge to each stockholder who so requests the powers,
designations, preferences, and relative, participating, optional, or other special rights of each class of stock or series thereof and the qualifications, limitations, or restrictions of such preferences and/or rights. 
 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	 	UNIF GIFT MIN ACT-	 	 	 	Custodian	 	 
	TEN ENT	  	–	 	as tenants by the entireties	 		 	(Cust)	 		 	(Minor)
	JT TEN	  	–	 	as joint tenants with right of	 		 	under Uniform Gifts to Minors
		  		 	survivorship and not as tenants	 		 	Act                                 	 	
		  		 	in common	 		 		 	(State)	 	

 Additional abbreviations may also be used though not in the above list. 
  

							
	For value received, the undersigned hereby sells, assigns and transfers into
			
	 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 capital stock represented by the within certificate, and to 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                                      
                   	 		 		 	
			
	 	 	 	 	  
		 	NOTICE:	 	THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR WITHOUT ALTERATION OR ENLARGEMENT OR ANY
CHANGE WHATEVER.
	 Signature(s) Guaranteed:
	 		 		 	
		 		 		 	
	THE SIGNATURE SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKHOLDERS 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 Molecular Insight Pharmaceuticals, Inc. and American Stock Transfer & Trust Company. LLC, dated as of January 30, 2009, and as such agreement may be amended (the “Rights Agreement”), the terms of which are
hereby incorporated herein by reference and a copy of which is on file at the principal executive offices of Molecular Insight Pharmaceuticals, Inc. 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. Molecular Insight Pharmaceuticals, Inc. will mail to the holder of this certificate a copy of the Rights Agreement without charge after receipt of a written request therefor.
Under certain circumstances as set forth in the Rights Agreement, Rights issued to, or held by, an Acquiring Person or any Affiliate or Associate thereof (as such terms are defined in the Rights Agreement), whether held by such person or any
subsequent holder, shall become null and void.