Controversies over stem-cell research are so last decade — or so it seemed until last week.
For the last few years, the promising field of stem-cell research has focused on a technique that skirts various ethical concerns about the treatment of human embryos and the potential to clone whole human beings. But last week, U.S. and South Korean researchers announced that they went ahead with a different technique, successfully creating stem cells cloned from the normal skin cells of adults. Their work helps to open a new avenue in stem-cell research. But it also could be a step on the way to human reproductive cloning.
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