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S. Koreans Clone Human Embryo

South Korean scientists report they have successfully cloned a human embryo and extracted embryonic stem cells — an important step toward therapeutic cloning. The achievement, reported in the journal Science, is certain to rekindle the debate over the ethics of cloning. Hear NPR's Joe Palca, NPR's Bob Edwards and Dr. Jeffrey Kahn, director of bioethics at the University of Minnesota.

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