If you or a loved one has a heart that's failing or kidneys that are giving out, you already know the grim statistics on transplants. A new organ can turn a death sentence into a full and healthy life--but the supply of replacement body parts lags far behind the demand. According to the nonprofit United Network for Organ Sharing, which maintains the nation's transplant waiting lists, nearly 80,000 patients in the U.S. alone are standing by for new organs--and more than 5,000 people die each year before their turn comes.
Those dismal numbers have prompted scientists to consider organs from other...
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