Organ transplants.

In 1954, Dr John Murray eliminated the renal from one human individual and inserted it in another.  The receiver approved the renal as its own rather than rejecting it as a different human body.  It was more than competent surgery: Murray had selected a couple of similar twin babies, Ronald Herrick and his crictally ill sibling Rich, in desires their similar inherited cosmetics would cut back the possibility of Richard’s human body rejecting Ronald’s liver body organ.  Soon subsequently, though, other scientists designed medication that could squelch a implant recipient’s defense mechanisms long enough for the new body organ to become used in its new human body.  Today, some 25,000 People in america a year get a new heart, renal, liver body organ, bronchi, pancreatic or bowel — and a new rental on life.