1. From Transplantation Immunology, Cardiothoracic Surgery (C.D., J.K., T.B., T.L., B.H., R.M.), Cardiovascular Medicine (J.L., T.S., P.S., P.F.), and Pathology (G.B.), Stanford University, Stanford, and Biopharmaceutical Sciences, University of California, San Francisco (U.C.), San Francisco, Calif.