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Induction of ohrA by H2O2. β-Galactosidase activity of strains containing the SPβc2Δ2∷Tn917∷φ(ohrA-cat-lacZ) reporter fusion were determined in wild type (HB2012), an ahpC∷Tn10 mutant (HB2038), a catalase mutant strain [HB2043; CU1065 katA∷pJH101 (32)], and the double mutant (HB2077). Samples were taken 15 min after treatment with H2O2 to a final concentration of (left to right) 0, 100, 200, 400, or 800 μM.
