The Francisella pathogenicity island. The two operons are depicted as a sequence of arrows in the direction of transcription. Arrows in light grey indicate genes with homology to known T6SS core components, while arrows in dark grey represent genes that lack T6SS component homology.
Lindgren et al. BMC Microbiology 2013 13:20 doi:10.1186/1471-2180-13-20