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The active site of cytochrome cbb3 from R. sphaeroides together with residues Y267, H311, H317, H318, and H405. According to molecular modeling, the Nε2 of the histidine 311 imidazol and the Cε2 of the tyrosine 311 phenol ring may come close enough to enable the formation of a covalent bond even though the amino acids originate from different helices (13, 14). The figure was prepared by using the Visual Molecular Dynamics software (18).
