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Position of the nonpolar residues Phe10, Trp25, Trp26 and Val52 (Ig-like module) and Pro389, Phe390 and Ala441 (catalytic module) at the intermodular region forming a hydrophobic pocket. In addition to polar interactions, Aa_Cel9A has a large number of residues involved in hydrophobic contacts between the Ig-like and catalytic modules.
