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Analysis of ahpC′::XA transcriptional fusions in strains grown under different oxidative stress conditions. β-Xylosidase activity in crude extracts was determined for wild-type (wt) strain IB277 and constitutive hpr mutant strain IB278 grown to mid-log phase and then either shaken in air for 1 h (culture exposed to oxygen), challenged with two successive 50 μM H2O2 treatments for 15 min each (addition of hydrogen peroxide), or incubated anaerobically (anaerobic culture).
