PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY
Genetic modification of cows, conceptual image. Researcher in a field holding a laboratory flask in front of a Jersey cow (Bos taurus). A cattle herder on horseback is in the background. This work is being done by the Bio Sidus biotechnology company, in Argentina, which successfully cloned a cow in 2002. The cloned cows are intended to be used to produce human growth hormone (hGH) in their milk.
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