A schematic presentation of the genomic islands described for B. petrii by bioinformatic analysis is shown . Direct repeats (DR) flanking the islands and their sequence position in the B. petrii genome are indicated. Direct repeats with identical or nearly identical DNA sequence are shown in the same colour (see also Figure 4). The approximate location of several characteristic genes such as the parA, ssb and topB genes found on all clc-like elements, integrases (int), or some relevant metabolic functions encoded by the islands are shown. In case tRNA genes are associated with the islands these are shown with an arrow indicating their transcriptional polarity. Finally, the approximate sizes of the predicted islands are indicated.