. . . . . . . . . . . . "[This article presents the results of original research conducted in St. Petersburg, Russia, which showed that the Helicobacter pylori strains isolated from patients with duodenal ulcer and chronic gastroduodenitis possess significantly higher levels of the pathogenicity islands (cag-PAI) genes than the strains isolated from healthy volunteers.]. 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 . "2014-10-02T12:36:18+02:00"^^ . . . . . . . . . . . "v2.1.0.0" . "v2.1.0" .