<p>The numbers indicate positions of the starting and ending residues in the sequence of <i>E. coli</i> AcrB. Asterisks, colons and periods indicate identical, conserved and semi-conserved residues, respectively. The sequences are: EC, AcrB from <i>E. coli</i>; PA, MexB from <i>Pseudomonas aeruginosa PAO1</i>; NM, MtrD from <i>Neisseria meningitidis 8013</i>; HC, hypothetical protein HcanM9_00968 from <i>Helicobacter canadensis MIT 98-5491</i>; SE, acridine efflux pump from <i>Salmonella enterica subsp. enterica serovar Typhimurium str. LT2</i>; LL, acriflavine resistance protein B from <i>Legionella longbeachae D-4968</i>; SM, hydrophobe/amphiphile efflux-1 (HAE1) from <i>Tenotrophomonas maltophilia R551-3</i>; MC, RND system efflux pump AcrB from <i>Moraxella catarrhalis RH4</i>.</p
