Stem Cell Double Play

A matched set of articles published online by the British science journal Nature last week seemed calculated to provide succor to both sides in the simmering stem-cell debate. In one study, University of Minnesota researchers isolated bone-marrow cells from adult mice, grew them in dishes and injected them into mouse embryos, where they developed into nerve, liver and other types of cells. In the other study, scientists from the National Institutes of Health did similar work with stem cells from mouse embryos, which developed into brain cells that produce dopamine and could be used to treat Parkinson's disease.

Proponents of human...

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