| http://www.w3.org/ns/prov#value | - It forms an essential part of the structure of hemoglobin and participates intimately in the uptake and release of oxygen by this protein. (In this case the use of the word coenzyme may be inappropriate in that often hemoglobin is not considered to be an enzyme, since it does not catalyze a chemical reaction.) Heme is an important part of the cytochromes, enzymes that catalyze the biochemical oxid
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