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Schematic drawing of virB gene complex showing both virB5 and bepA genes, based on data available for B. grahamii (isolate as4up) genome (accession number: NC012846, see [21]); virB (2–11) and bepA genes marked, with primers used to amplify virB5 gene and bepA gene fragment, and the size of amplicons. Positions in genome (nt) based on isolate NC012846
