β-endorphin associated_with chronic pain
Evidence from:
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Evidence (1 sources)
Combined analysis of circulating β-endorphin with gene polymorphisms in OPRM1, CACNAD2 and ABCB1 reveals correlation with pain, opioid sensitivity and opioid-related side effects.
(2013)
PMID:23402298
cited
plasma levels of β-endorphin ... were significantly lower in the chronic pain patients compared to control subjects
confidence: 0.96