Figure 1

Phylogenetic tree relating clusters of orthologous protein sequences (COGs):ABC type transport system for ribose, xylose, arabinose and galactoside, COG1172. The tree was constructed under a maximum likelihood approach using MEGA 5 software and the WAG with frequencies (+F) model. GeneBank accession numbers of the sequences included in the figure are provided in Additional file 2: Table S2.