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Molecular models of the H5 HA of the influenza virus A/Vietnam/1194/2004 complexed with 3′SLN (PDB accession number 4BGY). Panels A and B show different views of the same model. Sialosides are shown in stick representation, with carbon in blue, oxygen in red, and nitrogen in violet. HA is shown in surface representation; amino acids in positions discussed in the text (H3 HA numbering) are shown in color.
