Schematic presentation of the genomic region comprising the genomic islands GI1, GI2 and GI3. The GIs are shown as a red lines, their flanking direct repeat regions (DR) by red boxes (dark and light red for identical or nearly identical sequences, respectively) (see also Figure 4). The sequence position of the direct repeats and the approximate size of the islands are shown below the elements. The position of tRNA genes is indicated. Some relevant or characteristic genes encoded by the islands are shown above the elements. The bars below the elements show the expected dimensions of the element after excision from the genome. Stars indicate predicted elements which may use alternative direct repeat sequences for excision or elements composed of more than one island. Arrows above the bars indicate the approximate position of PCR primers and their names (in blue) designed for the amplification of the respective circular intermediates of these elements (Tab. 3).