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Phylogenetic tree of Actinomycetales Mce proteins. A non-redundant set of Mce protein sequences were aligned and an unrooted neighbor-joining tree was computed by MEGA. Coloring corresponds to the classification scheme specified in Table 3. ORFs are designated by [gene locus name | operon number (1–8) and gene position (A-F)]. Where operon orthology cannot be inferred, operons are designated: -1, -2.
