1. From the Department of Genetics, Harvard Medical School and Howard Hughes Medical Institute (M.A., I.P.M., F.A., G.H.L., P.G.B., J.P.S., A.P., C.E.S., J.G.S.), the Department of Pathology and Cardiac Registry, Children’s Hospital, and Harvard Medical School (I.P.M., A.R.P.-A.), the Department of Cardiology, Children’s Hospital and Department of Pediatrics, Harvard Medical School (V.V.P., C.T.M., C.I.B.), Boston University Medical Center, Myocardial Biology Unit (D.B.S., X.X.G.), and the Division of...