Dolly and Polly

In 1997, scientists announced the creation of Dolly, the world's first cloned sheep. One year later, the same scientists created Polly. Polly's claim to fame - she has a human gene in every one of her cells. Polly was genetically engineered to express human blood clotting factor IX in her milk. This protein is important to hemophiliacs, whose bodies do not produce the protein because of a genetic mutation. Polly was one of the first important pharming experiments - efforts to genetically engineer animals and plants to produce medically important products.

Source: Arizona State University. a.u. "Transgenic Animals: Chapter 19." (Online.) September 2002.

Explore More: Genetic Engineering
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