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Generalized phylogenies in diagrammatic form of NP, M, PB2, and PA genes of H9N2 influenza viruses. The nucleotide sequences of NP (1,381 bp), M (935 bp), PB2 (2,177 bp), and PA (2,125 bp) were used in the phylogenetic analysis. Only the major terminal branches of the Eurasian avian lineages of the trees are shown. Abbreviations are listed in Table 1.
