JOINT FILING AGREEMENTJoint Filing Agreement • August 2nd, 2012 • Bay City Capital LLC • Pharmaceutical preparations
Each of Bay City Capital LLC, Bay City Capital Management V LLC, Bay City Capital Fund V, L.P. and Bay City Capital Fund V Co-Investment Fund, L.P. hereby express its agreement that the attached Schedule 13D (and any amendments thereto) relating to the common stock of Hyperion Therapeutics, Inc. is filed on behalf of each of them.
