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Phylogenetic trees of H4 (A) and N6 (B) genes of H4N6 AIVs in China. Phylogenetic trees were generated by the neighbor-joining method and bootstrapped with 1000 replicates using MEGA6. Analysis was based on nucleotides 1–1693 of the HA gene and 1–1413 of the NA gene. Virus subtypes that are not H4N6 are indicated in brackets. Virus strains isolated in this study are highlighted in red.
