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Ribbon diagrams of the 1918 human HA (Protein Data Bank (PDB) ID: 1RUZ) and 2009 H1N1 NA in complexes with oseltamivir (PDB ID: 3TI6) with their receptor binding sites shown in blue circles. (A) HA monomer; (B) NA monomer; (C) trimeric HA and (D) tetrameric NA shown from the top.
