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Citrate-mediated gene expression. (A) qRT-PCR analysis of fnb gene expression in the WT strain in the absence (black bar) and presence (gray bar) of citrate. *, P < 0.05. (B) qRT-PCR analysis of fnb gene expression in the ΔgraR mutant in the absence (black bar) and presence (gray bar) of citrate. *, P < 0.05. The expression of the fnb genes is normalized to gyrB expression.
