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Structures of the lysine at residue 42 of WT PchB (A), a lysine mimetic assembly with propylamine (B), a lysine mimetic residue resulting from covalent modification of the cysteine variant with bromoethylamine (C), and a lysine-isosteric residue lacking electrostatic charge resulting from covalent modification of the cysteine variant with bromoethanol (D).
