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8bj8 is a 2 chain structure with sequence from Desulfovibrio desulfuricans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
PHFL_DESVH May be involved in hydrogen uptake for the reduction of sulfate to hydrogen sulfide in an electron transport chain. Cytochrome c3 is likely to be the physiological electron carrier for the enzyme.