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Model of polar sheathed flagellar assembly. Vibrio species have a single polar sheathed flagellum. The H-ring labeled in red is required in the assembly of the polar sheathed flagellum, in addition to flagellar stabilization. The dysfunction of FlgT causes the loss of the H-ring and, consequently, changes the polar flagellum to a periplasmic flagellum. OM, outer membrane; PG, peptidoglycan layer; IM, inner membrane.
