Genes up-regulated or down-regulated fourfold or greater in the presence of 30 mM benzoate.

aSignificant log2 expression ratio values are shown (p≤0.001). For genes represented by duplicate probes in the array, only the promoter-proximal probe is presented. bExpression ratios at pH 6 versus pH 7 [31] are indicated as +, higher at pH 6; –, higher at pH 7. cGenes within known sigma factor regulons [28], [68], [69] are indicated: SigB, σB; SigW, σW; SigH, σH. All other positive and negative regulation was obtained from the DBTBS database (http://dbtbs.hgc.jp/).