Researchers have identified a novel way to block pain signals, paving the way for better medications to treat chronic pain. Every year, one in five Americans reach for nonsteroidal anti-inflammatory drugs (NSAIDs) for headaches, arthritis, sprains, menstrual cramps and other types of pain. The drugs, sold under brand names including Advil, Aleve and Motrin, block the receptors COX-1 and COX-2, which …
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