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Unrooted phylogeneitc tree based on the Npro sequences. Phylogenetic tree of the Npro region from 16 BVDV positive samples were constructed by the neighbor-joining (NJ) method (Kimura two-parameter method) with the sequences published in GenBank. The nucleotide length of the Npro used for the analysis was 504 bp. The numbers at the phylogenetic branches indicate the bootstrap values (1000 replicates) in percentage supporting each group. The bar represents a genetic distance.
