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Video: Dolly the Sheep's cloned siblings are all healthy

Four "siblings" of Dolly the sheep are in good health, raising hopes that the cloning process does not detrimentally affect physical well-being.

Debbie, Denise, Dianna and Daisy have just passed their ninth birthday. They were cloned using cells from the same adult sheep as Dolly, who stunned the scientific community when she was born more than 20 years ago.

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