. . . . . . . "[The endogenous opioid beta-endorphin is a known indicator of stress and pain.]. Sentence from MEDLINE/PubMed, a database of the U.S. National Library of Medicine."@en . . . . . "2017-01-25"^^ . . "Gene-disease associations manually curated."@en . "DisGeNET evidence - CURATED"@en . "2017-10-17T13:15:31+02:00"^^ . . . . . . . . . . . "v5.0.0.0" . "v5.0.0" .