EXHIBIT A

AGREEMENT

Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required by Schedule 13D need to be filed with respect to the ownership by each of the undersigned of shares of Common Stock of Imago BioSciences, Inc.

Date: July 21, 2021	FRAZIER HEALTHCARE VII, L.P.
	By FHM VII, L.P., its general partner
	By FHM VII, L.L.C., its general partner
	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer
Date: July 21, 2021	FRAZIER HEALTHCARE VII-A, L.P.
	By FHM VII, L.P., its general partner
	By FHM VII, L.L.C., its general partner
	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer
Date: July 21, 2021	FHM VII, L.P.
	By FHM VII, L.L.C., its general partner
	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer
Date: July 21, 2021	FHM VII, L.L.C.
	By:	/s/ Steve R. Bailey
		Steve R. Bailey, Chief Financial Officer
Date: July 21, 2021	By:	*
		James N. Topper

Date: July 21, 2021	By:	*
		Patrick J. Heron
Date: July 21, 2021	By:	*
		Alan Frazier
Date: July 21, 2021	By:	*
		Nader Naini
Date: July 21, 2021	By:	*
		Nathan Every
Date: July 21, 2021	By:	*
		Brian Morfitt
Date: July 21, 2021	*By:	/s/ Steve R. Bailey
		Steve R. Bailey, as Attorney-in-Fact

This Agreement was executed by Steve R. Bailey on behalf of the individuals listed above pursuant to a Power of Attorney, a copy of which was filed with the SEC on March 29, 2016.

Page 2