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Order parameters S2 for the side-chain moieties that form a direct hydrogen bond to a DNA phosphate in at least one of the crystal structures of the wild-type Egr-1 zinc-finger – unmodified DNA complexes. (A) Order parameters for His imidazole Nδ1H bonds from the current study. (B) Order parameters of the Arg NεH and Lys NH3+ groups from our previous NMR study.3
