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Avidity-enhanced equilibrium dissociation constants of two H1 influenza viruses, A/PR8 (top panel) and A/K173 (bottom panel), to the 24 glycans as listed in Table 1. A/PR8 binds to both α2-3- and α2-6-linked sialosides, while A/K173 preferentially recognizes α2-6-linked sialosides. A/PR8 clearly binds to the glycan receptors more strongly than A/K173, A/Mem71, A/Udorn72 and A/Philips.
