ish researchers that they have genetically engineered sheep and goats to secrete drugs in their milk as a means of giving the biotech industry a streamlined means for producing many pharmaceuticals. The livestock produced in this manner are called transgenics because their cells contain foreign genes which direct the production of proteins with medicinal purposes. Goats developed at Tufts University and Genzyme Corporation in Cambridge, Massachusetts, for example, bear the gene for TPA, or tissue plasminogen activator, a drug used to dissolve blood clots in he
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