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(A) Transcriptional start sites of promoters upstream of rlrA, rrgA, rrgB, and srtB were mapped by primer extension analysis. The arrows indicate primer extension products. (B) Graphical depiction of the four rlrA pathogenicity islet promoters. A rightward arrow indicates the +1 start site. When present, −10 and −35 σ70 consensus sequences and predicted Shine-Dalgarno (SD) sequences are underlined and in bold.
