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Phylogenetic trees of NP, M, and NS genes. Trees were generated as described in the legend of Fig. 2 and in Materials and Methods. Analysis was based on nucleotides 31 to 917 (NP), 49 to 864 (M), and 88 to 815 (NS). The NP, M, and NS trees were rooted to A/equine/Prague/1/1956 (H7N7). Viruses characterized in this study are highlighted in red. Scale bar, 0.1 substitutions per site.
