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Growth curves of SgWT and atlS mutant strains under aerobic or anaerobic conditions in BHI (pH 7.0) or BHI that was acidified to pH 5.5 with HCl (A); in BHI broth with or without 0.003% hydrogen perioxide (B); and in BHI broth with or without 25 mM paraquat (C). Optical density at 600 nm was determined every 30 min for 24 h using a Bioscreen C.
