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Phylogenetic analysis of partial VP7 nucleotide sequences (nt 63 to 880) of serotype G4 strains. The phylogenetic tree was constructed using the neighbor-joining method and Kimura two-parameter model. Percentage bootstrap values above 60% are given at branch nodes. Nucleotide identity (id) within lineages is indicated in parentheses to the right of the sublineage. The number of substitutions per site is indicated by the scale bar.
