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Protein sequence alignment of homologous LysR-type transcriptional activators: ClcR (3), TcbR (36), TfdR (15), BenM, CatM (30), and CatR (31). Aligned residues identical or similar to those of BenM are in black or gray boxes, respectively. The underlined region, BenM residues 109 to 162, may be involved in inducer recognition.
