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Phylogenetic distribution of porcine parvoviruses (PPVs). It was inferred based on complete nucleotide sequences of the non-structural gene (NS) selected from representative strains of PPV1 through PPV7 obtained from the GenBank. The evolutionary tree was constructed with the neighbor–joining method by the p-distance model. The analysis involved 201 nucleotide sequences. Evolutionary analyses were conducted in MEGA7 [28].
