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Meet a mouse whose brain cortex is made up of human cells
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Meet a mouse whose brain cortex is made up of human cells

Neuroscientist Sergiu Pașca at Stanford has done something remarkable - he's created mice with human brain cells where their own cortex would normally be. By genetically engineering mice to lack most of their cortex and hippocampus, he created space for human neural tissue to grow and integrate with the rodent nervous system. The really fascinating part? These mice with human brain cells actually performed better on memory tests than mice with missing brain tissue alone, suggesting the human cells were genuinely contributing to their cognition. Now Pașca and his team are exploring how this xenocortical mouse could help us understand brain injuries and test treatments, while also being very careful about the ethical implications - he's drawing a clear line against trying this on primates.
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