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Dolly the sheep’s clones are perfectly healthy, which could be huge for the future of cloning

When Dolly the sheep died of lung disease and severe arthritis in 2003 after a relatively short seven year life, many scientists speculated that perhaps cloning had something to do with it. Could cloning an adult mammal, they wondered, make the clone adult-like right from birth. Maybe clones were not meant to live very long.

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