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Scientists discover the brain’s hidden “stop scratching” switch
Scientists have uncovered a hidden “stop-scratching” signal in the nervous system that tells your brain when enough scratching is enough. The discovery centers on a molecule called TRPV4, which acts like part of an internal braking system for itch relief. In experiments involving chronic itch similar to eczema, mice missing this signal scratched less often—but when they did scratch, they couldn’t stop.