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Expression levels (in Miller units) of PniaX-lacZ, PpnuC-lacZ, PnadC-lacZ, Pfba-lacZ, Prex-lacZ, PpncB-lacZ, Pgap-lacZ, PadhE-lacZ, PadhB2-lacZ, and PgapN-lacZ in CDM with 0 and 10 mM niacin in S. pneumoniae D39 wild-type. 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, **P < 0.001, and ***P < 0.0001).
