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Comparison of crystal structures of the three NSPs. Ribbon representation of (A) HNE (PDB: 1PPF) (B) CatG (PDB: 1CGH) and (C) Pr3 (PDB: 1FUJ). Arginine and lysine side chains are shown on the surface of the structures and side chains of the catalytic triad residues (His57, Asp102 and Ser195) in the center of each structure. This figure is available in black and white in print and in color at Glycobiology online.
