1.   It was feared his body was rejecting a kidney he received in a transplant four years ago.

2.   But another Stanford patient had to start taking the drugs four months after stopping when his body began rejecting the kidney.

3.   Immunosuppression medications to prevent his body from rejecting the kidney must be administered daily for the rest of his life.

4.   Indeed, the Navy monkeys eventually did reject their kidneys, showing that the antibody did not induce tolerance but merely suppressed the immune system, Knechtle said.

5.   Like humans who receive transplanted organs, he must take drugs to keep his body from rejecting the kidney.