@@ Robert Pennington, a 19 - year - old boy, suffers from liver disease. His name was put on a transplant waiting list, but no livers were available. Then Dr. Marlon Levy, a transplant surgeon at Baylor University Medical Center, offered an alternative: a procedure2 using a dead pig's liver. But not a liver from an ordinary pig, "They're genetically modified3 to try to prevent a reaction between the human blood and the pig liver" , Levy said.
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