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Down on the Animal Pharm

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Science  18 Dec 1998:
Vol. 282, Issue 5397, pp. 2177
DOI: 10.1126/science.282.5397.2177

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Although most of the agricultural gene transfers have been accomplished with plants, researchers are also introducing foreign genes into sheep, cows, and other livestock. Here the major goal so far has been to turn the animals into pharmaceutical factories on the hoof for valuable human proteins.