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TcuB contains two conserved Cys-X2-Cys-X2-Cys-X3-Cys-X motifs characteristic of proteins containing 4Fe-4S centers. The conserved Cys residues are shown in boxes. DmsB, dimethyl sulfoxide reductase subunit B; FrdB, fumarate reductase Fe-S subunit; NarH, nitrate reductase Fe-S subunit.
