Department of Surgery, College of Physicians and Surgeons of Columbia University, New York, New York 100321 This work was supported by NIH grants CA 52678 and HL 14799, and by the Kato Transplantation Fund.2Address correspondence and reprint requests to Soji F. Oluwole, M.D., Department of Surgery, College of Physicians and Surgeons of Columbia University, 630 West 168th St., New York, NY 10032.