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Structures of the three flagellar chaperones: FliT (this work) (A), FlgN (PDB ID code 2FUP) (B), and FliS (40) (C). The highly conserved Tyr residues that are crucial for the interaction of the substrate-bound chaperones with FlhA are labeled. The FlgN structure was resolved only up to residue Arg106 (Salmonella numbering), and the remaining C-terminal region was modeled in the structure.
