. . . . . . . "[The absence of this polymorphism, the small sample size and the heterogeneous ethnic backgrounds of participants in the pilot study allow only tentative conclusions based on the results, thus the role of the opioid receptor in pain and opioid reward respo]. Sentence from MEDLINE/PubMed, a database of the U.S. National Library of Medicine."@en . . . . . "2017-02-21"^^ . . "Gene-disease associations inferred from text-mining the literature."@en . "DisGeNET evidence - LITERATURE"@en . "2017-10-17T13:15:08+02:00"^^ . . . . . . . . . . . "v5.0.0.0" . "v5.0.0" .