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Multiple structure-based alignment of the amino acid sequences of E. coli YtfQ, AlsB, RbsB, and Salmonella typhimurium MglB proteins. Triangles indicate residues in contact with ligand in YtfQ (red direct, blue indirect). Blue stars indicate the aromatic residues that form part of the binding pocket. The cysteine residues (Cys-129 & Cys-193) that form the disulfide bond are labeled (green numeral 1).
