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. 2012 Dec 4;7(12):e50834. doi: 10.1371/journal.pone.0050834

Figure 6. ML phylogram of H4 sequences from North America and Eurasia including U.S. surveillance samples.

Figure 6

ML phylogram of influenza A subtype H4. Branch lengths represent genetic distance. Dots show nodes with significant bootstrap support. USDA surveillance sequences from avian fecal samples are shown in bold.