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https://www.nih.gov/news-events/nih-research-matters/sex-specific-pain-suppression-immune-cells
...female sex hormones can induce mT[reg] cells to produce enkephalin. Enkephalin, in turn, suppresses pain...`https://www.nih.gov/news-events/nih-research-matters/sex-specific-pain-suppression-immune-cells
