Phylogenetic tree of atpE genes from 13 mycobacterial species. The tree was created using PHYLIP (3). Branch lengths correspond to the number of nucleotides exchanges of the atpE genes. Species abbreviations: M.abs, M. abscessus (GenBank accession no. DQ306899); M.che, M. chelonae (GenBank accession no. DQ306894); M.mar, M. marinum (GenBank accession no. DQ306898); M.ulc, M. ulcerans (GenBank accession no. DQ306897); M.bov, M. bovis (GenBank accession no. DQ306895); Mtub, M. tuberculosis H37Rv (Swiss-Prot accession no. Q10598); M.avi, M. avium (GenBank accession no. DQ378275); M.int, M. intracellulare (GenBank accession no. DQ378276); M.xen, M. xenopi (GenBank accession no. DQ306893); M.lep, M. leprae (GenBank accession no. DQ306896); M.per, M. peregrinum (GenBank accession no. DQ378277); M.for, M. fortuitum (GenBank accession no. DQ378278); M.sme, M. smegmatis (GenBank accession no. DQ306892).