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Active site of sMMO from M. capsulatus (Bath) with helices B, C, E, and F labeled. (a) The diiron cluster in the oxidized Fe(III)Fe(III) state (PDB ID: 1MTY). (b) The diiron cluster in the reduced Fe(II)Fe(II) state (PDB ID: 1FYZ). (c) The diiron cluster in the mixed valent Fe(II)Fe(III) state (PDB ID: 1FZ0).
