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SPR bar plots. The bar plots (based on triplicate experiments for standard deviation) indicate normalized S-protein (A and C–F) or N501Y mutant (B) binding to surface heparin inhibited with different sulfated glycans and concentrations. Control bars are in gray, UFH in black, PpFucCS in blue, IbFucCS in red, and IbSF in green. The numbers on top of each bar (except for control bars used for normalization) indicate the average value obtained in the experiments.
