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Phylogenetic trees for the M gene (residues 41 to 671) of swine influenza viruses from southeastern China. The method used and abbreviations are as given in the legend to Fig. 1. Viruses isolated in this study are underlined. The tree is rooted at A/Equine/Prague/1/56 (H7N7). Abbreviations used in virus designations not used in the text are as follows: Ger, Germany; IA, Iowa; KY, Kentucky; Neth, The Netherlands.
