Where's the Beef?

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Science  30 Jan 1998:
Vol. 279, Issue 5351, pp. 647
DOI: 10.1126/science.279.5351.647

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In a perfect world, important scientific discoveries are impeccably documented and quickly replicated. But on page 635, two prominent biologists say that was not the case for Dolly, arguably the most famous lamb in history because she was reportedly cloned from adult cells. In a letter to the editor, they ask for more convincing evidence that the experiment that produced Dolly worked as claimed, which the researchers who performed the experiment continue to maintain. If in fact it hadn't, it would mean that human cloning, which for most conceivable purposes would start with adult cells, is not the immediate threat some worry about.