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Engineered chickens make cancer drugs

A team at the institute that cloned Dolly the sheep have made a genetically engineered chicken that produces cancer drugs in its eggs. [...] Many human therapeutic proteins are produced in industrial bioreactors, but setting up such systems is both time-consuming and expensive. [...] Scientists have been trying to find good ways to turn animals into factories instead. [...] The researchers have now bred several hundred chickens that can produce the desired proteins.