(A–C) qRT-PCR analysis from log phase cultures of either WT, ΔrnhC, ΔrnhC cells with rnhC expressed at an ectopic locus (ΔrnhC rnhC+) carrying the reporter gene lacZ (A) or luxABCDE (B). (C) Cells were induced and harvested in stationary phase. CD, co-directional (black bars); HO, head-on (gray bars). Data represent the means and SEM of at least three independent experiments. n.s., not significant. *p < 0.05.