1. From the Institute of Clinical Chemistry and Laboratory Medicine (M.T., V.O., F.C., H.R., K.J.L.), Department of Medicine II (A.L.K., M.O., A.D., S.B., T.M.), Department of Pharmacology (H.L., U.F.), Central Laboratory Animal Facility (K.R.), Johannes Gutenberg University, Mainz, Germany; Division of Cardiology (S.T), University of California, San Diego, Calif; Institute Universitaire de Pathologie (H-A.L.), Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland.