A heart doctor has given a patient a transfusion of pig's blood in an operation that may pave the way for animal-to-human organ transplants.Dr. Dhaniram Baruah, a London surgeon, injected more than half a pint of the blood into a man suffering from severe anemia.Baruah, 50, says he has developed a method of preventing the rejection of animal tissue by the human body, and hopes to continue research on animal donors in human medicine.

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