1. From the Structural and Computational Biology and Molecular Biophysics Program (G.J.A.) and Departments of Cell Biology (C.B.B.), Pediatrics (G.W.V.), Medicine (W.I., J.D.M.), and Biochemistry (J.D.M.), Baylor College of Medicine; Heartscan (D.M.S.); and statistical consultant (K.T.K.), Houston, Tex.