Phylogenetic trees of a) 16S rRNA of bacteria containing the Nan cluster b) NanA. The trees were obtained using Bayesian analysis as implemented in MrBayes. 1,000,000 generations were used to build the consensus trees. Only confidence values below 85 are shown. Blue Operational Taxonomic Units (OTUs) indicate Gram-negative Bacteria; red OTUs, Gram-positive Bacteria; black OTUs, Eukaryotes. For NanA tree the five main lineages are highlighted with color brackets embracing them. Lineage I, green bracket; lineage II, light blue bracket; lineage III, purple bracket; lineage IV, yellow bracket; lineage V, grey bracket.