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Aromatic-carbohydrate interactions in the processive Cel6A tunnel. A, surface representation of T. reesei Cel6A showing the catalytic domain with the cello-oligomer within the binding tunnel. The carbohydrate-binding module and linker are not shown. Tryptophans are shown in blue. The catalytic residue, aspartic acid 221 (D221), is shown in magenta. B, a detailed view of the Cel6A catalytic domain tunnel.
