Journal of General Virology |

Fig. 2. Phylogenetic tree of the NP gene of influenza A viruses. The tree is rooted to the NP gene of B/Lee/40 and is based on 323 bp (residues 10761398). Horizontal lines are proportional to the numbers of nucleotide substitutions between branch points. To preserve space, only the terminal branches of the avian lineage are presented and underlined viruses indicate those that were sequenced in this study. Abbreviations of virus sequences are as follows: Ty/Min/81, A/Turkey/Minnesota/1661/81 (H1N1); Dk/Man/53, A/Duck/Manitoba/1/53 (H10N7); Mall/Ny/78, A/Mallard/New York/6750/78 (H2N2); Sw/HK/93, A/Swine/Hong Kong/168/93 (H1N1); Oyst/Ger/87, A/Oystercatcher/Germany/87 (H1N1); FPV34, A/FPV/Rostock/34 (H7N1); Dk/Eng/56, A/Duck/England/1/56 (H11N6); Bud/Ho/77, A/Budgerigar/Hokkaido/1/77 (H4N6); Dk/Bav/77, A/Duck/Bavaria/2/77 (H1N1); Anas/Pri/76, A/Anas Acuta/Primorje/695/76 (H2N3); Gs/Gd/1/96, A/Goose/Guangdong/1/96 (H5N1); Dk/HK/y439/97, A/Duck/Hong Kong/y439/97 (H9N2); Mall/It/24/95, A/Mallard/Italy/24/95 (H1N1); HK/156/97, A/Hong Kong/156/97 (H5N1); Quail/HK/97, A/Quail/Hong Kong/61/97 (H9N2); Ck/Bei/1/94, A/Chicken/Beijing/1/94 (H9N2); Sw/Ger/91, A/Swine/Germany/8533/91 (H1N1); Sw/It/89, A/Swine/Italy/839/89 (H1N1); Sw/Neth/85, A/Swine/Netherland/12/85 (H1N1); Sw/Ger/81, A/Swine/Germany/2/81 (H1N1).
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