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Sequence of the PnfrA promoter region. The putative −10, −16, and −35 regions are indicated by gray backgrounds. The ςD promoter (34) is indicated by boxes. Only the effects of single mutations within this region are shown. Mutations resulting in elevated promoter activity are shown above the wild-type sequence; mutations resulting in reduced transcriptional activity are shown below. M, A or C; S, G or C; K, G or T; V, A, G, or C.
