1. From the Department of Cardiology (Innere Medizin III), University of Heidelberg (N.F., H.A.K.), Heidelberg, Germany, and Departments of Molecular Biology (E.N.O., J.A.H.) and Internal Medicine (J.A.H.) and the Donald W. Reynolds Cardiovascular Clinical Research Center (E.N.O., J.A.H.), University of Texas Southwestern Medical Center, Dallas, Tex.