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Nature 445, 802 (22 February 2007) | doi:10.1038/445802a; Published online 21 February 2007

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Cloning special: Dolly: a hard act to follow

Erika Check

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Cloning mammals has proved to be more difficult than researchers hoped.

Four years after Dolly's death, scientists are still amazed she was ever born. That's because the decade since the announcement of Dolly's birth has brought cloning researchers few triumphs and many frustrations.

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