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Scientists make cloned embryos from skin cells
WHO: Dr. George Daley, Dr. Samuel Wood
WHAT: they have produced embryos that are clones of two men, a potential step toward developing scientifically valuable stem cells. But it's not the first time human cloned embryos have been made. In 2005, for example, scientists in Britain reported using embryonic stem cells to produce a cloned embryo.
WHERE: California
WHEN: Thu January 17, 2008
WHY: Scientists say stem cells from cloned embryos could provide a valuable tool for studying diseases, screening drugs and, perhaps someday, creating transplant material to treat conditions like diabetes and Parkinson's disease.
HOW: The cloning approach involves inserting DNA from a person into an egg, and then growing the egg into an embryo about five days old before extracting the stem cells. At that stage, the embryo is a sphere of about 150 cells. In the new work, researchers took skin cells from Wood and another volunteer and produced three embryos with DNA matching the men's. Further DNA testing on one of these embryos strengthened the case that it was a clone.
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