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. 2012 Jul 12;7(7):e40422. doi: 10.1371/journal.pone.0040422

Figure 7. Phylogenetic tree of HA for HA-NA available strains of A/H1N1 virus.

Figure 7

The phylogenetic tree was constructed using 998 complete HA-coding nucleotide sequences for HA-NA available strains of A/H1N1 virus. Cluster I and II correspond to those in Figure S2. (A) The strain names at exterior nodes were colored according to the net-charge in HA1; red: +14-+16, pink: +12-+13, orange: +10-+11, yellow: +8-+9, right blue: +6-+7, and blue: +4-+5. (B) The strain names at exterior nodes were colored red or orange when they had triple (Gln222, Met234, and Tyr274) or single (Tyr274) amino acid mutation in NA, respectively.