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Tim Andrews, who received a pigÕs kidney transplant in late January and was well enough to be discharged a week later, is examined by Dr. Leonardo Riella at Mass General Hospital in Boston on Feb. 5, 2025. It was the fourth pig kidney transplant in the United States, and the first of three that will be done at Mass General as part of a new clinical trial sanctioned by the FDA. (Billy Hickey/The New York Times/Fotoarena)
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