1. Department of Surgery (C.L., B.K., Z.W., Y.L., A.N.), Philadelphia, Pennsylvania 19104-5160
2. Division of Transplantation, Department of Pathology and Laboratory Medicine (M.D.F., J.E.T.), Philadelphia, Pennsylvania 19104-5160
3. Department of Medicine (R.M., M.R.R.), Division of Endocrinology, Diabetes and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104-5160
4. Caliper Life Sciences (K.L., C.C.H.), Hopkinton, Massachusetts 01748-1602