How scientists built a mouse with a half-human brain
The method starts with donated skin cells, grows them into human brain organoids, and ends with roughly four million human neurons living inside a mouse skull.
Why xenocortical mice matter for brain medicine
The human brain is locked inside a skull and no animal brain is a good copy of it. That is why schizophrenia, epilepsy and dementia still have so few real treatments.
The ethics of mice with human brains
The tissue in these mice is immature and the animals were not enhanced. But the ethical questions start long before any mouse gets smarter.
A half-human mouse brain versus machine AI
ChatGPT learns from oceans of data on silicon. A xenocortical mouse learns from a body, on living neurons grown from human DNA. The comparison says a lot about both.
What are xenocortical mice? A plain-English guide
In September 2026, researchers at Stanford announced mice whose brains are half human tissue. Here is what the animals actually are, in language that does not need a neuroscience degree.