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Growth in brain heart infusion broth of wild-type (▪, aerobic; □, anaerobic) and micB::km mutant (•, aerobic; ○, anaerobic) CFU of S. pneumoniae D39 (A) and S6 (B). n = 3 for each time point; error bars indicate standard error of the mean. OD 500, optical density at 500 nm.
