Human brain cells colonize 90% of cortex in engineered mice, raising ethics alarms
sterlingcrispin · x · 2026-09-17
Scientists injected human brain cells into mice genetically engineered to lack about half their brain. The cells grew to colonize roughly 90% of the cortex, integrating with mouse neurons — a process the researchers call "xenocortication."
- The human cells didn't just occupy space; they partially restored lost function
- Some mice were then deprived of oxygen to induce brain damage and measure impairment
- The work aims to study human brain development, but the author argues it crosses clear ethical lines
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