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Growth curves of S. mutans wild-type and its lrg (a) and cid (b) derivatives under oxidative stress. Strains were grown in BHI medium containing 10 mM paraquat under anaerobic conditions. Growth was monitored in a Bioscreen C system that was set to shake for 15 s every 30 min. For anaerobic growth, sterile mineral oil (50 μl) was placed on top of the broth cultures. The results are representative of two independent experiments.
