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Doctors in the USA have a pig's heart into a man. It is the first time this has . The doctors are from the University of Maryland Medical Center. They say David Bennett, 57, is well after his operation. Mr Bennett was very ill. The doctors said giving him the pig's heart was the only chance of him alive. Bennett to doctors the day before the operation. He said: "It either die or do this transplant. I want to live. I it's a shot in the dark, but it's my last choice." The pig's heart from a genetically-modified pig. Scientists the genes of the pig so its heart would more suitable for a transplant into a human.

The transplant operation seven hours. Doctors special permission from U.S. authorities for the experimental surgery. Without it, Mr Bennett would have . Scientists have been pig-organ transplants for years. They believe Mr Bennett's transplant means more transplants could place in the future. They said this could bring the world, "one step closer to the organ shortage crisis". Surgeon Dr Bartley Griffith said: "We also optimistic that this first-in-the-world surgery will an important new option for patients in the future." Mr Bennett hopes his transplant will him to live longer. He said: "I look forward to getting out of bed after I ."