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Comparison of the predicted amino acid sequences of the regulatory proteins AggR, Rns, and PerA with the amino acid sequence of RegA. Sequences were aligned by using the ClustalW program. The amino acids in the putative helix-turn-helix regions are underlined. Identical amino acid residues are indicated by asterisks, conserved residues are indicated by a colons, and semiconserved residues are indicated by periods. C. r., C. rodentium.
