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Tomorrow Today

A New Heart Grown from Stem Cells

Researchers in Heidelberg are trying to engineer human hearts for transplanting. To head off the risk of organ rejection, they hope to build it using stem cells from the future recipient. The scaffold the cells are to grow on is taken from a pig's heart. But the researchers caution that decades may pass before they produce a functioning human heart.

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Should the new method prove successful, it would be used primarily to create replacement organs for the lungs, liver or kidneys.