EDITOR’S NOTE: Watch “Dr. Sanjay Gupta Reports: Animal Pharm” on Sunday, May 18, at 8 p.m. ET/PT on CNN. There were more than 48,000 organ transplants in the United States last year. They’re ...

There were more than 48,000 organ transplants in the United States last year. They’re commonplace now, but the practice was considered experimental only a half-century ago. Until just the past few ...

The organ seemed to function as well as a human kidney transplant, and the doctors did not see any signs of rejection. “We learned more from that than anything else that we’ve done,” Dr. Robert ...