Figure 2

Histograms showing the cell populations expressing DntR (a), NagR (b) and NtdR (c). The fluorescence from the gfp reporter gene under the control of the P_DNT promoter is measured for 10000 cells. The background level of fluorescence where only the solvent DMSO has been added to a cell population harbouring the one-plasmid system (solid red) and DMSO + IPTG added to cells harbouring the two-plasmid system (dashed dark red). The fluorescence level for the cell population with salicylate added for the one-plasmid system (solid green) and for the two-plasmid system (dashed green).