. . . . . . . . . . . . "[Other studies have implicated the neurotransmitter serotonin or polymorphisms in the serotonin transporter gene (5HTT) as an important source of variability in `externalizing` behaviors such as aggressivity, conduct disorder, and attention deficit-hyperactivity disorders (ADHD).]. Sentence from MEDLINE/PubMed, a database of the U.S. National Library of Medicine."@en . . . . . "2014-02-25"^^ . . "Gene-disease associations inferred from text-mining the literature."@en . "DisGeNET evidence - LITERATURE"@en . "2014-10-02T12:37:47+02:00"^^ . . . . . . . . . . . "v2.1.0.0" . "v2.1.0" .