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Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended, (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. §1350), Sammy Farah, President and Chief Executive Officer of Turnstone Biologics Corp. (the “Company”), and Wendy Worcester, Vice President, Controller of the Company, each hereby certifies that, to the best of his or her knowledge:

1.
The Company’s Quarterly Report on Form 10-Q for the period ended March 31, 2025, to which this Certification is attached as Exhibit 32.1 (the “Periodic Report”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Exchange Act; and
2.
The information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

 

Dated: May 8, 2025

 

/s/ Sammy Farah

 

/s/ Wendy Worcester

Sammy Farah, M.B.A., Ph.D.

President and Chief Executive Officer

 

Wendy Worcester

Vice President, Controller

(Principal Executive Officer)

 

(Principal Financial and Accounting Officer)

 

This certification accompanies the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.