1. From the Department of Molecular and Medical Pharmacology and Crump Institute for Molecular Imaging (J.C.W., I.Y.C., J.J.M., G.S., A.D., S.S.G.), the Department of Pathology (J.H.Q., M.C.F.), and the Department of Medicine, Division of Cardiology (J.C.W.), UCLA School of Medicine, Los Angeles, Calif; and the Department of Radiology and Bio-X Program (S.S.G.), Stanford University, Stanford, Calif.