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This undated photo provided by researcher Katsuhiko Hayashi shows an adult mouse which was born from an egg cell produced from a skin cell, and her pups born normally. The eggs were produced by making skin cells revert to a kind of blank slate, so they could be prodded to develop into immature egg cells. The new work was reported online Thursday, Oct. 3, 2012, in the journal Science by a team at Kyoto University.

Katsuhiko Hayashi