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Structure of the C-cluster from CODHCh II at 600 mV including only one coordinating residue: histidine and the ligands proposed to be important in catalytic activities. Atom colors: Dark gray (iron), orange (sulfide), red (oxygen), blue (nitrogen), white (carbon), dark green (nickel). Unbound red spheres represent the water molecules. Generated using Pymol from PDB 3B51.
