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Expression levels (in Miller units) of PnagA-lacZ, PnagB-lacZ, PglmS-lacZ, PnanE-lacZ, and PmanL-lacZ in S. pneumoniae D39 wild-type grown in CDM either with 0.5% glucose or with 0.5% NAG. Standard deviations of three independent experiments are indicated in bars. Statistical significance of the differences in the expression levels was determined by one-way ANOVA (NS, not significant and ***P < 0.0001).
