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Schematic representation of the predicted Fe/S cluster contents of two hydrogenases from I. album compared to two related and experimentally characterized hydrogenases from Thermotoga maritima and Thermoanaerobacter tengcongensis. H, H cluster; 2Fe, [2Fe-2S] cluster; 4Fe, [4Fe-4S] cluster; NuoF, FMN and NAD(P)(H) binding domain.
