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Putative membrane topology of stator proteins, PomA/B, MotA and MotB. Amino acid residues marked by a circle in the transmembrane helix of the B subunit are the sites of attention in this study. Abbreviations: VP, Vibrio parahaemolyticus; VC, Vibrio cholera; SWA, Shewanella oneidensis; RSH, Rhodobacter sphaeroides; Pae, Pseudomonas aeruginosa; EC, Escherichia coli.
