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Phylogenetic trees of NP (A), M (B), and NS (C) 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 1–1497 of the NP gene, 1–982 of the M gene, and 1–838 of the NS gene. Virus subtypes that are not H4N6 are indicated in brackets. Virus strains isolated in this study are highlighted in red.
