. . . . . . . . . . . . "[It is unclear whether the DRD4 gene is a marker for an underlying propensity for greater urge or whether the DRD4 gene differentially moderates the neuroadaptive effects of extended substance use on urge.]. Sentence from MEDLINE/PubMed, a database of the U.S. National Library of Medicine."@en . . . . . "2016-02-19"^^ . . "Gene-disease associations inferred from text-mining the literature."@en . "DisGeNET evidence - LITERATURE"@en . "2016-05-13T12:46:10+02:00"^^ . . . . . . . . . . . "v4.0.0.0" . "v4.0.0" .