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Phylogenetic analysis of partial VP4 nucleotide sequences (25 to 500) of type P[8] strains. The phylogenetic tree was constructed by the neighbor-joining method and Kimura's two-parameter model, and statistical support was provided by bootstrapping of 1,000 pseudoreplicates. The sequence of P[4] strain PA28 was used as the outgroup. Bootstrap values above 49% are given at branch nodes.
