FIGURE 4.
Phylogenetic trees displaying the relationship between the A-modules (A) and R-modules (B) in different secreted mannuronan C-5 epimerases. The A. vinelandii epimerases are denoted by E and enzyme number, AlgY is a protein homologous to AlgE-epimerases in A. vinelandii, PsmE is the P. syringae secreted epimerase, and the putative A. chroococcum epimerases are identified by their loci numbers. When one enzyme contains several A or R-modules, these are each numbered according to Figure 3.
