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Binding pocket of Hd-SatA with Neu5Ac. A ball-and-stick diagram shows Neu5Ac and its interacting residues in Hd-SatA. Inset, 2Fo − Fc map at 1σ level showing the electron density map of Neu5Ac in the binding pocket of Hd-SatA. The program PyMOL (Schrödinger) (54) was used to create the figure.
