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A model of the active site of cytochrome cbb3. The hemes and the copper center of the catalytic subunit are shown together with the axial histidine ligands of the hemes originating from helix X. The glutamate 383 residue suggested to form a hydrogen bond (dotted red line) with histidine 405 is located in helix IX. The figure was prepared using the Visual Molecular Dynamics software (45).
