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Active site structure in both the as-isolated oxidized state (blue) and the semi-reduced active state (gray). The change in oxidation state has significant effects on residues responsible for substrate binding (His-71) and peroxide bond cleavage (Gln-104 and Glu-114). (Figure of the oxidized and semi-reduced forms was prepared with Protein Data Bank files 1eb7.pdb and 2hvd.pdb, respectively).
