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Alignment of DNA sequences of the cbbR-cbbL intergenic regions of X. flavus (XF), T. ferrooxidans (TF), and R. eutropha (RE). The CbbR binding motif is given below the alignment. ∗, identical nucleotides. Brackets, positions of LysR motifs. Inverted and direct repeats are in boldface. Positions of the −35 and −10 regions of the cbb promoter are indicated. +1, cbbL transcription start site. The start codon of the cbbR gene of X. flavus is underlined.
