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Decrease in mgtA and pbgP transcription observed in the igaA1 mutant is promoted by RcsB via RpoS and is independent of RcsA. Expression of mgtA::lacZ (A) and pbgP::lacZ (B) fusions was monitored in isogenic wild-type and igaA1 strains lacking RcsB, RpoS, and RcsA regulators. Bacteria were grown to the stationary phase in LB (LB-ST). The data are the means and standard errors for a minimum of three independent experiments for each strain. wt, wild type.
