AGREEMENT

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 13G need be filed with respect to the ownership by each of the undersigned of Class A Common Stock of FS Development Corp. II.

Date: December 17, 2021				XXXXXXX LIFE SCIENCES X, L.P.
				By FHMLS X, L.P., its general partner
				By FHMLS X, L.L.C., its general partner
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: December 17, 2021				FHMLS X, L.P.
				By FHMLS X, L.L.C., its general partner
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: December 17, 2021				FHMLS X, L.L.C.
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: December 17, 2021				XXXXXXX LIFE SCIENCES PUBLIC FUND L.P.
				By: FHMLSP, L.P., its General Partner
				By: FHMLSP, L.L.C., its General Partner
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: December 17, 2021				FHMLSP, L.P.
				By: FHMLSP, L.L.C., its General Partner
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: December 17, 2021				FHMLSP, L.L.C.
				By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, Chief Financial Officer
Date: December 17, 2021				By:		*
						Xxxxx X. Xxxxxx

Date: December 17, 2021				By:		*
						Xxxxxxx X. Xxxxx
Date: December 17, 2021				By:		**
						Xxxxxx Xxx
Date: December 17, 2021				By:		**
						Xxxxx Xxxxx
Date: December 17, 2021				*By:		/s/ Xxxxx X. Xxxxxx
						Xxxxx X. Xxxxxx, as Attorney-in-Fact

* This Agreement was executed by Xxxxx X. Xxxxxx on behalf of the individuals listed above pursuant to a Power of Attorney, a copy of which was filed with the SEC on February 24, 2017.

** This Agreement was executed by Xxxxx X. Xxxxxx on behalf of the individuals listed above pursuant to a Power of Attorney, a copy of which was filed with the SEC on August 16, 2021.