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. 2014 Oct 15;9(10):e111565. doi: 10.1371/journal.pone.0111565

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© 2014 The PLOS ONE Staff

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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In presence of peroxide, ferrous RH are oxidized to their ferric (Fe^III) and/or ferryl (Fe^IV) 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”.