A recent article by the CAZy team , defines and describes in an extended manner:
(i) the catalytic mechanisms covered by the PL classification;
(ii) the know PL activities and how these are distributed in the present PL families;
(iii) the diversity of folds exhibited in structurally characterized PL families;
(iv) the new layer of PL subfamilies that has been defined throughout the PL families.
 Lombard V, Bernard T, Rancurel C, Brumer H, Coutinho PM, Henrissat B (2010) A hierarchical classification of polysaccharide lyases for glycogenomics. Biochem. J. 432:437-444 [PMID: 20925655].