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Organization of protein domains in typical SdhB proteins versus SdhB-n and SdhB-c from Euglena and trypanosomatids. SdhB-n contains the [2Fe-2S]-cluster-binding domain characteristic of the N-terminus of typical SdhB. SdhB-c contains [3Fe-4S]- and [4Fe-4S]-cluster-binding domains that are present in the C-terminal half of SdhB.
