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A schematic version of the STM4316-rtsA intergenic region. The rtsA promoter-specific transcript is indicated with an arrow, and the sequence of the start site is marked as +1. The nucleotide sequence of the rtsA promoter region is shown below. The rtsA promoter “−10” and “−35” elements are underlined. The rtsA transcription start site was determined by primer extension as described in Materials and Methods.
