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Comparisons of CtrA proteins and DNA binding sites. (A) Alignment of the CtrA amino acid sequences from R. capsulatus and C. crescentus. Identical amino acids (71%) are boxed, and the putative sequence specific DNA recognition domains of the proteins are shaded. (B) The consensus CtrA-binding site of C. crescentus compared with potential CtrA-binding sites located 5′ of the R. capsulatus ctrA gene. Sites 1 and 2 are ≈70 bp and 30 bp 5′ of the ctrA start codon, respectively.
