A transgenic animal has had its genes changed to optimize certain characteristics. Greater milk production and more milk proteins have been observed from transgenic cows and goats. Mice have been injected with genes suspected to cause Alzheimer's disease in the search for a cure. And a spider gene was injected into a goat's genome. The goat then produced the same protein found in spider silk in its milk. This protein was then extracted and made into silk fibers for bulletproof vests.
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