1. From the Center for Fetal Monkey Gene Transfer for Heart, Lung and Blood Diseases (A.F.T.), California National Primate Research Center; Departments of Pediatrics (C.A.P., C.S.M., B.D.T., T.J.C., M.A.L., D.E.C., I.Z., B.J.B.) and the Congenital Heart Center (B.J.B.), University of Florida, Gainesville; and Department of Pediatrics and Cell Biology and Human Anatomy (A.F.T.), University of California, Davis.