1. From the Departments of Surgery (M.R.B.), Internal Medicine (F.J.M., W.-G.L., J.D.M., P.C., A.A.S., N.L.W.), Anatomy and Cell Biology (J.F.E.), and Biochemistry (A.N.E., X.F., A.A.S.), and Radiation Research Laboratory (L.W.O.), University of Iowa College of Medicine, Iowa City, Iowa; Institute for Human Gene Therapy (R.M.Z.), University of Pennsylvania Medical Center, Philadelphia, Pa; and Department of Surgery (R.M.Z.), University of Edinburgh, MRC Human Genetics Unit, Edinburgh, UK.