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Ferrochelatase (EC 4.99.1.1) catalyzes the insertion of ferrous iron into protoporphyrin IX to form protoheme IX. This membrane-bound enzyme has been cloned from a variety of bacteria, plants, mammals, and yeast. Interestingly, only in mammals has the enzyme been found to contain a [2Fe-2S] cluster. Since the presence of this feature only in mammals would have significant evolutionary implications...
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