EX-4.1





 



 
 MNK CUSIP 603693 10 2 INCORPORATED UNDER THE LAWS OF THE STATE SEE REVERSE FOR CERTAIN OF DELAWARE DEFINITIONS AND LEGENDS This
certifies that BY: AMERICAN COUNTERSIGNED is the record holder of STOCKAND FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK, $0.00001 PAR VALUE PER SHARE, OF (BROOKLYN, MINK THERAPEUTICS, INC. TRANSFER transferable on the books of the Corporation
in person or by duly authorized attorney upon surrender of this Certificate properly NY)& endorsed. This Certificate is not valid until countersigned by the Transfer Agent and registered by the Registrar.TRUST REGISTERED: WITNESS the facsimile
seal of the Corporation and the facsimile signatures of its duly authorized officers.                 Dated: AUTHORIZED AND RAPEU TRANSFERCOMPANY, E TI H PO C T OR RAT
S, LLC N K C E I N I C SIGNATURE REGISTRAR AGENT CHIEF EXECUTIVE OFFICER M SEAL . TREASURER July 5, 2017 HD EH EL AWAR 












 



 
 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. Such requests shall be made to the
Corporation’s Secretary at the principal office of the Corporation. KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, OR DESTROYED THE CORPORATION WILL REQUIRE A BOND INDEMNITY AS A CONDITION TO THE ISSUANCE OF A REPLACEMENT
CERTIFICATE. 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..............................................................................
(State)                in common    COM PROP –    as community property UNIF TRF MIN ACT – ................. Custodian
(until age ..................) (Cust) ..................................... (Minor) under Uniform Transfers to Minors Act............................................................ (State) Additional abbreviations may also be used though not in the
above list. FOR VALUE RECEIVED, _____________________________________________________ hereby sell(s), assign(s) and transfer(s) unto PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS,
INCLUDING ZIP CODE, OF ASSIGNEE) share s of the capital stock represented by within Certificate, and o hereby irrevocably constitute and appoint attorney-in-fact to
transfer the said stock on the books of the within named Corporation with full power of the substitution in the premises. Dated X X Signature(s) Guaranteed: 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 WHATSOEVER. By 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. GUARANTEES BY A NOTARY PUBLIC ARE NOT ACCEPTABLE. SIGNATURE GUARANTEES
MUST NOT BE DATED.