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The Cα drawing of two crystallographic interacting molecules from the H. grisea Cel12A structure (A), colored blue, and two NCS interacting molecules from the T. reesei P201C mutant structure (B), colored red, showing that the packing of the two NCS molecules in the T. reesei crystals prevents any potential ligand binding in the catalytic cleft, but that the packing of the molecules in the H. grisea crystal potentially allows binding of a ligand.
