. . . . . . . "[Other variants modulate the perception of pain (e.g., OPRM1 or GCH1 variants conferring modest pain protection by increasing the tone of the endogenous opioid system or decreasing nitric oxide formation).]. Sentence from MEDLINE/PubMed, a database of the U.S. National Library of Medicine."@en . . . . . "2017-02-19"^^ . . "Gene-disease associations inferred from text-mining the literature."@en . "DisGeNET evidence - LITERATURE"@en . "2017-10-17T13:12:56+02:00"^^ . . . . . . . . . . . "v5.0.0.0" . "v5.0.0" .