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Neighbor-joining nucleotide distance tree for residues representing nucleotides 11 to 887 of the VP4 gene of the indicated genotype P[8] strains. The G type is indicated for each strain. Sequences were aligned by using CLUSTALX and analyzed by using the DNADIST and NEIGHBOR programs in PHYLIP. The accession numbers of the reference strains used in this analysis were L34161 (for Wa) (46), U30716 (for F45) (37), and M21014 (for KU) (57).
