Misguided Chromosomes Foil Primate Cloning

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Science  11 Apr 2003:
Vol. 300, Issue 5617, pp. 225-227
DOI: 10.1126/science.300.5617.225

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While governments debate how to prevent human reproductive cloning, it seems that nature has put a few hurdles of its own in the way. On page 297, a team reports that in rhesus monkeys, cloning robs an embryo of key proteins that allow a cell to divvy up chromosomes and divide properly. Unpublished data from this and other groups suggest that the same problem may also thwart attempts to clone humans.