Consent of Independent Registered Public Accounting Firm

We consent to the reference to our firm under the caption "Experts" in Amendment No. 1 to the Registration Statement (Form S-1 No. 333-275458) and related Prospectus of Athersys, Inc. for the registration of 76,249,180 shares of its common stock and to the incorporation by reference therein of our report dated March 31, 2023, with respect to the consolidated financial statements of Athersys, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2022, filed with the Securities and Exchange Commission.

/s/ ERNST & YOUNG LLP

Cleveland, Ohio

November 21, 2023