Type	Name	Date
Underwriting agreement	Underwriting Agreement, among Conatus Pharmaceuticals Inc. and Stifel, Nicolaus & Company, Incorporated and SunTrust Robinson Humphrey, Inc., as representatives of the several underwriters named therein	05/11/2017
Underwriting agreement	Underwriting Agreement, among Conatus Pharmaceuticals Inc. and Stifel, Nicolaus & Company, Incorporated and Roth Capital Partners, LLC, as representatives of the several underwriters named therein	04/02/2015

Type	Name	Date
By-Laws	Amended and Restated Bylaws	05/27/2020
By-Laws	Amended and Restated Bylaws of Conatus Pharmaceuticals Inc	08/01/2013

Type	Name	Date
Employment agreement	Employment Agreement between Histogen, Inc. and Susan A. Knudson	05/28/2020
Employment agreement	Amendment to Employment Agreement, by and between Steven J. Mento, Ph.D. and Conatus Pharmaceuticals Inc	08/01/2019
Employment agreement	Employment Agreement, between Conatus Pharmaceuticals Inc. and Michelle L. Vandertie	03/21/2017

Type	Name	Date
Merger agreement	Agreement and Plan of Merger, by and among Conatus Pharmaceuticals Inc., Chinook Merger Sub, Inc. and Histogen Inc	01/28/2020

Type	Name	Date
Lease agreement	First Amendment to Lease, by and between Histogen Inc. and San Diego Sycamore, LLC	06/25/2021
Lease agreement	First Amendment to Lease Agreement by and between the Point Office Partners, LLC and the Company	06/04/2015