GoKawiilStanford researchers grow mice with brains nearly half made of human neurons
Stanford scientists genetically engineered mice lacking a functioning cortex, then implanted human neurons derived from reprogrammed skin cells into the empty space. The transplanted cells multiplied from a few hundred to several million and wired themselves into the mouse brain, with the animals behaving largely normally despite the human tissue making up nearly half their brain volume by some measures. The findings were published in Nature.
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This gives researchers a living model to study human-specific brain circuitry and neurological disorders that can't be replicated in petri-dish organoids or animal brains alone. It could accelerate research into conditions like autism or schizophrenia, but the scale of human neural integration into an animal brain also raises new ethical questions about consciousness and moral status in chimeric research.
- Stanford scientists implanted human cortex neurons into mice lacking that brain region
- The human cells multiplied into the millions and functionally integrated with mouse brains
- The advance could improve disease modeling but raises ethical concerns about human-animal chimeras
Source: futurism.com — Frank Landymore, 2026-09-20
Published there as: “Scientists Unleash Franken-Mice With Brains That Are Nearly Half Human”
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