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Schematic drawing of the structure of the homologous proteins YscU and FlhB adapted from the studies by Allaoui et al. (3) and Minamino and Macnab (31). Black numbers indicate amino acid positions of YscU, and numbers in italics (gray) represent those of FlhB. The sequence NPTH (amino acids 263 to 266 and amino acids 269 to 272) is conserved through the YscU/FlhB family and contains the proline-270 where FlhB has been shown to be cleaved (31).
