Exhibit 4.1

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 |  | under Uniform Gifts to Minors
|  | of survivorship and not as tenants |  | Act
|  | in common |  | (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 common stock evidenced by this Certificate, and do hereby irrevocably constitute and appoint

Attorney

to transfer the said shares 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 OF THE STOCKHOLDER(S) AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

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. |  |