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That will become increasingly important as the Institute continues mapping not just mouse neurons, but human ones. It’s easy to target specific regions in the mouse brain, getting electrical readings from neurons in a particular part of the visual cortex. It’s not so easy to get location-specific neurons from humans. “These cells actually come from patients—people who have having neurosurgery for epilepsy, or the removal of tumors,” says Ng. For a surgeon to get to the part of the brain that needs work, they must remove a certain amount of normal tissue that’s in the way, and it’s that tissue that neuroscientists are able to study.