Fig. 6. Receptor specificity of four European swine influenza viruses. The receptor-binding specificities of the four European swine influenza viruses H1N2, H1avN2hu, H1pdmN2sw and H3N2 were tested in a dose-dependent glycan array assay against the sialyl glycans 2,6-α-SL, 2,6-α-SLN and 2,3-α-SL.