FIG. 4.

Regulatory sequences upstream of areC. The start codon of areC is indicated, and the putative ribosome binding site (Shine-Dalgarno) of areC is indicated above the sequence (RBS). The nucleotides corresponding to both primer extension signals (Fig. 3) are indicated by the double-headed arrow with the strongest numbered as the +1 site. The putative −12, −24 promoter elements are indicated. Arrows below the sequence mark an inverted repeat that is hypothesized to act as the binding site for the regulator protein. Dashed arrows above the sequence mark a direct repeat.