Scientists can’t make a living copy of your brain outside your body. That’s the stuff of science fiction. But in a new study, they recreated a critical brain component, the blood-brain barrier, that functioned as it would in the individual who provided the cells to make it. Their achievement—detailed in a study published today in the peer-reviewed journal Cell Stem Cell—provides a new way to make discoveries about brain disorders and, potentially, predict which drugs will work best for an individual patient.

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