In the first pig-to-human heart transplant in 2022, scientists used a donor animal with 10 edits. The recipient, David Bennett, lived for two months following the procedure.

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One monkey lasted much longer, living 758 days after the kidney transplant. Monkeys with pig kidneys missing the human genes didn’t fare nearly as well, surviving a median of 24 days.

In each organ, between one in 1,000 and one in 10,000 cells turned out to be a monkey cells — in other words, the interspecies chimeras were more than 99% pig.