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Three hemes, bp, bn and cn, are located within the b6f hydrophobic core. Hemes bp and bn are axially ligated by histidines from cyt b6. Heme cn, a unique heme without an amino acid axial ligand, is linked to a conserved Cys35 residue of cyt b6, and is axially ligated by a water or hydroxide molecule (red sphere).
