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Schematic representation of phylogenetic tree constructed using the 254 Burkholderia CeoB-like sequence. Sequences that present the same residues in positions corresponding to positions 4-5 of E. coli AcrB are highlighted. Abbreviations: A = Alanine; C = Cysteine; F = Phenylalanine; L = Leucine; M = Methionine; S = Serine; W = Tryptophan; X = any hydrophobic aminoacid; HAE1 = Hydrophobe/Amphiphile Efflux-1; HME = Heavy-Metal Efflux; U.F. = Uncertain Function.
