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Doctors transplanted a pig's heart into a
for the first
. The man is 57 and was very
. The pig's heart was his only chance of staying
. He is doing well after his
. He spoke to
before the operation. He said: "It was either die or do this
. I want to live." The pig's
came from a genetically-modified pig. Scientists changed the pig's
so it would work in a
.