1. From the Institute of Molecular Medicine (J.K., E.B.) and the Human Genetics Center (E.B.), University of Texas–Houston Health Science Center, Houston, Tex; Department of Human Genetics (R.F.), University of Pittsburgh, Pittsburgh, Pa; National Heart, Lung, and Blood Institute (S.C.M.), Bethesda, Md; Division of Hypertension (S.T.T.), Department of Internal Medicine, Mayo Clinic, Rochester, Minn; and Department of Human Genetics (C.F.S.), University of Michigan, Ann Arbor, Mich.