FIG 2.

Organization of P. aeruginosa CDI systems. (A) The cdi1 and cdi2 loci are displayed as blue arrows in their genetic orientation within P. aeruginosa strain PAO1. Core genes outside the cdi loci are colored purple. O28 and O30, colored orange, represent orphan immunity genes located in the intergenic region downstream of the functional cdiBAI cluster. Black arrows indicate the predicted promoter sites. (B) Alignment of the P. aeruginosa strain PAO1 cdi2 locus and flanking regions to the same genetic region in strain DK2, which does not contain a cdi2 locus.