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Active site of the W290 variants superimposed with wild type galactose oxidase (A) W290H (B) W290F (C) W290G and (D) wild-type azide complex. The structure of wild-type galactose oxidase is shown in green and that of the variant or azide structure is shown superimposed in atom-based color. The positions of the exogenous ligands in each structure are also shown. The figure was generated using SPOCK (79).
