Figure 3From: Phylogenetic diversity and genotypic complexity of H1N1 subtype swine influenza viruses isolated in Mainland ChinaPhylogenetic tree of the PB2 genes of the H1N1 subtype swine influenza viruses. The unrooted phylogenetic trees were generated by the neighbor-joining method using MEGA 5.0 software. Bootstrap values were calculated out of 1000 replicates and only bootstrap values of ≥70% were shown. Different lineages were indicated by different colors.Back to article page