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In presence of peroxide, ferrous RH are oxidized to their ferric (FeIII) and/or ferryl (FeIV) forms. Upper: Hp binds Hb (ferrous and/or ferric) thereby preventing its release. Lower: Mb heme is retained attached to globin following oxidation in a peroxidase-like form. However, binding of CO to ferrous Mb prevents its oxidation to a ‘peroxidase-like form”.
