How to Clone a Herd

First there was Dolly the Scottish sheep. Then, last July, came several litters of cloned mice. Now scientists at Japan's Kinki University have produced something even bigger and a good deal tastier: eight identical calves cloned from a single cow.

Writing in last week's issue of Science, the Japanese researchers report that they achieved this feat of bovine photocopying using two different types of cells, taken from a single cow's ovaries and fallopian tubes. Those cells--all carrying the same genetic payload--were introduced into cow ova whose genes had been scooped away. Ten such identical embryos were then implanted in the wombs...

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