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Phylogenetic tree of VP4 nucleotide sequences of G3P[19] porcine rotavirus strains isolated from 2000 to 2001, demonstrating a close genetic relationship with human rotavirus reference strains (Mc323, Mc345, and RMC321) that were isolated from 1989 to 1990. Bootstrap values supporting some clusters are shown at the branch nodes. Branch length for a 10% nucleotide difference is indicated at the bottom.
