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Characterization of oprD promoter elements. Transcription of oprD in P. aeruginosa PAO1 initiates with equal frequencies from two start sites, located 23 bases (SS1) and 71 bases (SS2) upstream of the structural gene (ATG translation start codon is highlighted in orange). The putative −10 and −35 promoter elements for SS1 are highlighted in red, and the putative −10 and −35 promoter elements for SS2 are highlighted in blue.
