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. 2015 Jul 24;10(7):e0133795. doi: 10.1371/journal.pone.0133795

Fig 3. Evolutionary relatedness of PA gene segments of H1N1 IAVs of avian, swine and human origins isolated from North America and Eurasia.

Fig 3

The taxa are colored based on their host and geography: red-North American avian isolates from the St. Jude repository, light blue-North American avian isolates, purple-Eurasian avian isolates, green- swine isolates from North America, grey- swine isolates from Eurasia (both Eurasian avian-like swine and Eurasian classical swine), dark blue-human isolates from North America; orange- human isolates from Eurasia, and pink- 2009 pandemic isolates. The nodes with spillover avian H1N1 IAVs are denoted with light blue arrows.