science · 23 February 1997 · 27 years ago
In 1997, the successful cloning of an adult mammal was announced: a female lamb named "Dolly" that was born 5 Jul 1996. The accomplishment of a group of scientists supervised by Ian Wilmut at Roslin Institute, Edinburgh, Scotland, was primarily the work of biologist Keith Campbell. Dolly was the first mammal ever successfully cloned from a cell from an adult animal. Using microscopic needles, scientists had replaced the nucleus of an egg cell with the nucleus from a parent udder cell. The resulting embryo was implanted into the womb of a third, surrogate sheep. Dolly's DNA was matched to show she was a clone. Dolly lived until 14 Feb 2003, when she was put down due to the effects of a progressive lung disease.
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