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Structural view of a part of the active site cleft of chitosanase CsnN174. The image represents a portion of the chain A from 1CHK file in Protein Data Bank [6]. Catalytic residues: Glu22 (general acid), Asp40 (general base). Relevant interatomic distances in Å are indicated by interrupted yellow lines. The model was drawn using PyMOL software (PyMOL version 0.99, DeLano Scientific LLC, South San Francisco, CA, USA).
