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Stem Cells

In two separate experiments, scientists have repaired injured rodent hearts by transplanting into them stem cells, cells that are capable of developing into many cell types. The stem cells stimulated the development of new blood vessels and muscle tissue in the hearts of mice and rats. While more research needs to be done before the procedure can be tried in humans, NPR's Richard Harris reports that scientists hope that it will someday help people who've had heart attacks.

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