Mice with human brain cells offer a tool to study disease. Ethicists ask: What’s next?0

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• September 16, 2026

This side view of a lab mouse brain shows nerve fibers extending from the human graft (colored with green and red fluorescent proteins) through the mouse brain (colored with blue). Scale bar = 1 mm. S. Pașca lab/Stanford University hide caption toggle caption S. Pașca lab/Stanford University Researchers have developed a new way to install