Group I: Our standard steroid avoidance protocol, i.e., 3 daily doses of 1 mg/kg of Thymoglobulin®, the first to be infused at surgery, accompanied by 2 doses of anti-CD25 humanized monoclonal antibody, the first also to be given at surgery, and the second 2 weeks later. (controls) Group II: A new steroid avoidance protocol in which 1 dose of 1 mg/kg of Thymoglobulin® is to be infused at surgery followed by 1 dose of alemtuzumab (Campath-1H) at 0.3 mg/kg within 24 hours. No further antibody therapy will be used.