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Nature 443, 376-377 (28 September 2006) | doi:10.1038/443376a; Published online 27 September 2006

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Stem cells derived from 'dead' human embryo

Helen Pearson & Alison Abbott

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IVF cast-offs could provide 'ethical' source of eggs.

It has no brain, heart or nervous system. So how can researchers tell when an embryo has died?