. . . . . . . "[The plasma ?-endorphin levels were significantly higher in controls than in pain patients.A higher incidence of opioid-related side effects and sex differences was found in patients with the minor allele of the ABCB1 gene.]. 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 . "2017-10-17T13:15:31+02:00"^^ . . . . . . . . . . . "v5.0.0.0" . "v5.0.0" .