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Phylogenetic tree illustrating the similarity between the nucleotide sequences of the H7 HA gene from the isolates used in these studies (arrows). Sequences were aligned with the Clustal V program (Lasergene, version 10.0; DNAStar, Madison, WI). Phylogenetic analysis for the H7 gene was performed with PAUP*, version 4.0b10 (Sinauer Associates, Inc., Sunderland, MA), using the maximum parsimony tree-building method with heuristic search and 500 bootstrap replicates.
