1. From the Departments of Medicine and Biochemistry and Molecular Biology (S.C., C.L.H., I.Y.C., D.P.V., J.D.M.), Baylor College of Medicine; The Methodist Hospital (M.R., G.L.); Department of Pediatrics (G.W.V.), Texas Children’s Hospital; and Department of Radiology (C.K.), The Methodist Hospital Research Institute, Houston, Tex.