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3D structure prediction models of SmeChi-1 (a) and SmeChi-2 (b). The 3D structure models were predicted using the SWISS-MODEL program (http://swissmodel.expasy.org/). The structure of the catalytic domain of acidic mammalian chitinase from Homo sapiens (Protein Data Bank [PDB] ID: 3FY1) and those of chitin-binding proteins from Tachypleus tridentatus (PDB ID: 1DQC) were used as a template.
