Exhibit 1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common Stock, par value $0.001, of Athersys, Inc. and further agree that this agreement be included as an exhibit to such filing. Each party to this agreement expressly authorizes each other party to file on its behalf any and all amendments to such statement. Each party to this agreement agrees that this agreement may be signed in counterparts.

In evidence whereof, the undersigned have caused this joint filing agreement to be executed on their behalf this 13th day of February, 2015.

A.M. PAPPAS LIFE SCIENCE VENTURES III, LP
By:	AMP&A Management III, LLC General Partner
By:	/s/ Ford S. Worthy
Name:	Ford S. Worthy
Title:	Partner & Chief Financial Officer
PV III CEO FUND, LP
By:	AMP&A Management III, LLC General Partner
By:	/s/ Ford S. Worthy
Name:	Ford S. Worthy
Title:	Partner & Chief Financial Officer
AMP&A MANAGEMENT III, LLC
By:	/s/ Ford S. Worthy
Name:	Ford S. Worthy
Title:	Partner & Chief Financial Officer
A. M. PAPPAS & ASSOCIATES, LLC
By:	/s/ Ford S. Worthy
Name:	Ford S. Worthy
Title:	Partner