Putative link between LasR and Psl control in P. aeruginosa PAO1. A. CHIP-chip analysis performed with LasR-specific antibodies . The signal peak near the bottom left corner of the panel indicates enrichment of psl promoter fragments and the vertical light grey bar represents the pslA gene (PA2231). The data were visualized using SignalMap (Nimblegen). B. psl EPS locus. C. pel EPS locus.