Comparative analysis of putative eps-clusters. A) Putative eps-clusters for the “Bifido” strains. Phylogenetic tree is as in Figure 2. B) Putative eps-clusters for the “Firm-4″ strains. Similarity was estimated with tblastx, using a length filter of 100 bp. Pink: dTDP-rhamnose biosynthesis genes, Green: ABC transporter genes, Yellow: glycosyl-transferases or genes with orthology to known eps genes, Orange: glycosyl-hydrolases, Brown: C-terminal domain of priming glycosyl-transferase, Grey: other genes with a putative function in polysaccharide biosynthesis. Light blue: putative catalase, dark blue: putative manganese transporter and repressor. For a complete list of protein domain predictions, see Additional file 12: Table S3.