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A 75 yr. old who transplanted kidney is making a medical history. At a meeting of the American College of Surgeons, Dr. Carolyn B. Coulam of the Mayo Clinic reported that a woman from Minnesota who received a kidney from her mother in 1969 has since had 2 children and the aging kidney has undergone a remarkable rejuvenation.

This tends to support the theory that aging is a result of outside factors working on body tissues, rather than the other major aging theory, which holds that cells have an inherited biological clock that causes them to age regardless of their environment.