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. 2015 Nov 10;5:15928. doi: 10.1038/srep15928

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Each indicated virus was assessed for binding to an α2,6-linked SA (red lines) and α2,3-linked SA (blue lines) glyocpolymer in a solid phase binding assay. Viruses used include SD2/H9N2 (a), SD3/H9N2 (b), JL3/H9N2 (c), and XD/H1N1 (d). The amino acid residue at HA1 position 226 is indicated for each virus.