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Cytochrome c peroxidase (CCP) catalyses the reduction of H 2 O 2 to H 2 O, an important step in the cellular detoxification process. The crystal structure of the di-heme CCP from Pseudomonas nautica 617 was obtained in two different conformations in a redox state with the electron transfer heme reduced. Form IN, obtained at pH 4.0, does not contain Ca 2+ and was refined...