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Tracy, a transgenic sheep, Scotland, 1999

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‘Tracy’ the sheep (1990-97) was genetically modified to produce a human protein, alpha antitrypsin, in her milk. The protein is being clinically tested by PPL Therapeutics, who also donated Tracy to the Science Museum, with the aim of finding a treatment for the symptoms of cystic fibrosis. Tracy was born in 1990 after human DNA was inserted into fertilised sheep embryos at the Roslin Institute near Edinburgh, Scotland. In an attempt to reproduce animals such as Tracy, the Roslin Institute later cloned Dolly the sheep.

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trial term