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Growth study. Streptococcus mutans strains were grown in brain–heart infusion broth with or without the addition of methyl viologen (MV, 18 mM, final concentration). Data presented here are representatives of more than four independent experiments. Arrow indicates the time when methyl viologen was added to the growth medium, and ‘x’ on growth curves illustrates disruption of measurement of the cultural optical density at 600 nm.
