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Pandemic (H1N1) 2009 viruses and human H1N1 viruses isolated in the 2010/2011 season were analyzed. Arrows indicate the pandemic (H1N1) 2009 viruses used in this study. Viruses are colored-coded according to the amino acid residues at positions 106 and 248; Blue, 106V and 248N; Orange, 106V and 248D; Green, 106I and 248N; and Red, 106I and 248D.
