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First transmitted in 1997, this is the story of how and why Dolly the sheep, the first cloned copy of an adult mammal, came to be created.

First transmitted in 1997, this is the story of how and why Dolly the sheep, the first cloned copy of an adult mammal, came to be created. Horizon reports on the cloning experiments that came before and looks at the bizarre possibilities that lie ahead.

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