1. From the Program in Integrative Cardiac Metabolism (K.M.P., N.S., M.F., J.M.O., E.D.L.), Center for Cardiovascular Research, University of Illinois at Chicago, College of Medicine; Department of Internal Medicine (K.B., H.T.), Division of Cardiology, University of Texas Houston Medical School, Houston; and Department of Molecular and Cellular Physiology (D.A.B., K.F.L.), Pennsylvania State University Medical School, Hershey.