1I77:
reference: Spectroscopic investigation and determination of reactivity and structure of the tetraheme cytochrome c3 from Desulfovibrio desulfuricans Essex 6., Einsle O, Foerster S, Mann K, Fritz G, Messerschmidt A, Kroneck PM, Eur J Biochem 2001 May;268(10):3028-35. PMID: 11358521

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