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Nature 421, 4 (2 January 2003) | doi:10.1038/421004b

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Biotech critic tries to sew up research on chimaeras

Erika Check

Scientists who are seeking to meld human embryonic stem cells with mouse embryos have been warned that they could be sued if they pursue the idea.The 'chimaeric' embryos would be used to test the stem cells' ability to divide into cells with different functions (see Nature 420, 255; 2002).