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3b1s is a 6 chain structure with sequence from Aquifex aeolicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
FLHB_AQUAE Required for formation of the rod structure in the basal body of the flagellar apparatus. Together with FliI and FliH, may constitute the export apparatus of flagellin (By similarity).