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A small portion of the Iho670 flagellar-like filament reconstruction and atomic model [46], with a few sidechains shown. The red N-terminal helix is homologous with the N-terminal helix present in bacterial Type IV pili, but the packing of helices in these filaments is very different, and this helix is continuous in the flagellar-like filament but not in at least some bacterial pili.
