1. From the Cardiovascular Division, Department of Medicine (L.Z., J.G., P.Z., Q.X., S.S.R., J.Z.), Department of Integrative Biology and Physiology, School of Medicine (S.C.W., T.D.O.C.), Stem Cell Institute and Department of Pediatrics (L.X., J.T., M.K.), and Department of Surgery (K.L.), University of Minnesota, Minneapolis, MN; and Department of Cardiology, First Affiliated Hospital, Nanjing Medical University, Nanjing, China (J.G.).