Overlap of the ArcA regulon in response to H
, aerobiosis and anaerobiosis. Numbers indicate the amount of genes that show statistically significant differential expression in a ΔarcA mutant vs a wild type strain 14028s in the respective condition. The number of genes (A) positively or (B) negatively regulated by ArcA in each condition is shown. Genes regulated by ArcA in anaerobiosis were obtained from . Genes regulated by ArcA in aerobiosis with or without H2O2 are detailed in Additional file 2: Table S2. Genes with a fold change of ≥ 2 and an FDR q value of ≤ 0.05 for each category were considered to be differentially expressed.