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First Embryonic Stem Cells Cloned From A Man’s Skin

Eighteen years ago, scientists in Scotland took the nuclear DNA from the cell of an adult sheep and put it into another sheep’s egg cell that had been emptied of its own nucleus. The resulting egg was implanted in the womb of a third sheep, and the result was Dolly, the first clone of a mammal.

Dolly’s birth set off a huge outpouring of ethical concern — along with hope that the same techniques, applied to human cells, could be used to treat myriad diseases.

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