A man in Massachusetts just became the first person to receive a pig kidney transplant.

Scientists have been developing genetically engineered pigs as a way to address the critical lack of human organs available for transplant surgeries. Several proof-of-concept experiments with such pig organs have been done in recent years; one involved hooking a kidney up to a brain-dead organ donor’s body, and another involved performing a double-kidney transplant in a brain-dead patient. In addition, in 2022, a man underwent the first pig-heart transplant but died shortly thereafter.

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