TRPV4, an ion channel, is found in neurons classically associated with touch, called Aβ low-threshold mechanoreceptors. New research indicates that TRPV4 can generate itch, but it also helps trigger a negative feedback signal, a neural message that tells the spinal cord and brain that scratching has been sufficient. Image Courtesy of Roberta Gualdani Researchers have discovered that the ion channel TRPV4 plays a critical role in regulating the body's built-in "stop-scratching

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