Figure 2. (A) Schematic representation of the S. mutans fxp operon. (B) Comparison of the promoter regions of fxp operons from Streptococcus mutans (Smu), Streptococcus pneumoniae (Spn), Streptococcus pyogenes (Spy), and Streptococcus equi (Seq). The -35, -10, and CRE regions are boxed. The beginning of fxpA and the direct repeats are indicated. Underlined nucleotides correspond to direct repeats in the promoter regions.

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