... clusters positioned most closely to the borderlineFig. 4. Evolutionary tree of SBDs from CBM20 and CBM21. For an explanation of the colour code for enzymes and the abbreviations used for the sources, ... Glucoamylasestructural, functional, and evolutionary relationships.Proteins 29, 334–347.65 Williamson MP, Le Gal-Coeffet MF, Sorimachi K,Furniss CS, Archer DB & Williamson G (1997) Func-tion of conserved ... CBM20 module. They were therefore used astemplates for revealing the corresponding regions in the CBM21 family.Secondary structure prediction together with fold recognition indicated thatthe CBM21...