Figure 2. Phylogenetic trees comparing the internal genes of swine influenza virus (H1N2) from Chile (red) and reference viruses. We performed phylogenetic analysis for the matrix (A), nucleoprotein (B), nonstructural (C), polymerase acid (D), polymerase basic (PB) 1 (E), and PB2 (F) gene segments by using RAxML with 200-bootstraps replicates (21). Purple indicates location of control influenza A(H1N1)pdm09 CA/09 virus. Scale bars indicate number of substitutions per site. Detailed phylogenetic trees for these genes are provided in Technical Appendix Figures 1–6.