This undated handout image courtesy of the National Science ...
AFP
Wed Dec 2, 1:52 PM
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This undated handout image courtesy of the National Science Foundation (NSF) shows mouse embryonic stem cells stained with a fluorescent green marker for embryonic germ cells. US authorities Wednesday approved 13 new lines of human embryonic stem cells for scientific research in the first such move since the Obama administration lifted a ban on their use. Photo:Niels Geijsen/AFP

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