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Assembly of the core type IV pilus biogenesis platform in the inner membrane. The figure shows, from Left to Right, TtPilMN, TtPilMNO, and TtPilMNO–TtPilA437–122 complexes. Approximate locations of the inner membrane (dotted lines) and transmembrane helices are shown. Color coding of the components of the complexes is as for Figs. 4–6.
