passages.id: split_6_test_3071_passage
passages.type: progene_text
passages.text: The known genes in region IIIa are fliABCD , all of which are involved in filament structure and assembly , while region IIIb contains genes fliEFGHIJKLMNOPQR , all of which are related to formation of the hook ( basal - body ) - complex or to even earlier assembly events .