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Activation of class I promoters by MarA and SoxS and their mutants at position E89 (MarA) or V83 (SoxS). The absolute β-galactosidase values (Miller units [MU]) for the fpr::lacZ fusion (left-hand scale) and the mdtG::lacZ and acrAB::lacZ fusions (right-hand scale) are plotted for the plasmid control, MarA, MarA(E89A), MarA(E89V), SoxS, and SoxS(V83E).
