13D Filing: James E. Flynn and Homology Medicines Inc (FIXX)

CUSIP No.  438083107

Schedule A

General Partner of Deerfield Mgmt, L.P.

The general partner of Deerfield Mgmt is
J.E. Flynn Capital, LLC. The address of the principal business and/or principal office of Deerfield Mgmt and J.E. Flynn Capital,
LLC is 780 Third Avenue, 37^th Floor, New York, New York 10017.

General Partner of Deerfield
Partners, L.P.

The general partner of Deerfield Partners
is Deerfield Mgmt. The address of the principal business and/or principal office of Deerfield Mgmt and Deerfield Partners is 780
Third Avenue, 37^th Floor, New York, New York 10017.

General Partner of Deerfield Mgmt III,
L.P.

The general partner of Deerfield Mgmt III
is J.E. Flynn Capital III, LLC. The address of the principal business and/or principal office of Deerfield Mgmt III and J.E. Flynn
Capital III, LLC is 780 Third Avenue, 37^th Floor, New York, New York 10017.

General Partner of Deerfield Private Design Fund
III, L.P.

The general partner of Deerfield Private
Design Fund III is Deerfield Mgmt III. The address of the principal business and/or principal office of Deerfield Mgmt III and
Deerfield Private Design Fund III is 780 Third Avenue, 37^th Floor, New York, New York 10017.

General Partner of Deerfield Healthcare
Innovations Fund, L.P.

The general partner of Deerfield Healthcare
Innovations Fund is Deerfield Mgmt HIF, L.P. The address of the principal business and/or principal office of Deerfield Healthcare
Innovations Fund and Deerfield Mgmt HIF, L.P is 780 Third Avenue, 37^th Floor, New York, New York 10017.

General Partner of Deerfield Mgmt HIF,
L.P.

The general partner of Deerfield Mgmt HIF
is J.E. Flynn Capital HIF, LLC. The address of the principal business and/or principal office of Deerfield Mgmt HIF, L.P. and J.E.
Flynn Capital HIF, LLC is 780 Third Avenue, 37^th Floor, New York, New York 10017.

General Partner of Deerfield Management
Company, L.P.

The general partner of Deerfield Management
is Flynn Management LLC. The address of the principal business and/or principal office of Deerfield Management and Flynn Management
LLC is 780 Third Avenue, 37^th Floor, New York, New York 10017.