Chinese researchers grow world’s first human organ inside a non-human animal
Human kidney tissue has been grown inside a pig embryo for the first time, with roughly half the cells in the developing kidney being human. Researchers in Guangzhou reprogrammed adult human cells, then injected them into pig embryos engineered to leave a “gap” where their own kidneys would form. The human cells moved in and self-organized into an early-stage kidney structure over 28 days of gestation. It’s not a transplantable organ, and real ethical questions remain about keeping human cells out of pig brains. But for the 100,000 Americans waiting for a kidney right now, this is a meaningful step toward a future where no one dies waiting.









