FIG 2 .
FPSS treatment reduces transcript levels of σB-dependent opuCA and gadA. Normalized log-transformed opuCA (A) and gadA (B) transcript levels in L. monocytogenes 10403S exposed to 0.3 M NaCl to induce σB activity in the presence of FPSS at concentrations ranging from 1 to 64 µM; controls included strains 10403S and its isogenic ∆sigB mutant exposed to 0.3 M NaCl. Transcript levels were quantified by qRT-PCR, log10 transformed, and normalized to the geometric mean of the transcript levels for the housekeeping genes rpoB and gap. The data are means from three replicates; error bars show the standard deviations.