FIG. 3.

Generalized phylogeny of M1, NP, PA, and PB1 genes of influenza viruses. H6 influenza viruses characterized in this study are underlined. Nucleotide ranges used to construct the phylogenetic trees are shown in Table 4. Gene sequences used in this study are listed under the following EMBL Nucleotide Sequence Database accession numbers: AF098560, AF036358, AF156463, AF250482, AJ278646, AF057293, AF036359, AF156470, AF250480, AJ289871, AF098604, AF046095, AF156449, AF250478, AJ404637, AF098590, AF036362, AF156421, AF250477, and AJ404634.