1. From Donald W. Reynolds Cardiovascular Clinical Research Center at Dallas (K.R.W., L.Y., F.X., J.C.C., H.H.H.), Departments of Molecular Genetics and Internal Medicine, McDermott Center for Human Growth and Development, Center for Human Nutrition (G.L.V., S.M.G., J.C.C.), and Howard Hughes Medical Institute (H.H.H.), University of Texas Southwestern Medical Center at Dallas, Tex.