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a, 3F-β-Neu5Ac covalently bound in the NanC active site (PDB code 4YW0). The Fo − Fc omit map electron density map is carved around the ligand and Tyr-695 and contoured at a level of 3 σ (magenta mesh). b, a schematic representation of the interactions between 3F-β-Neu5Ac and the NanC active site.
