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Dendrogram of 34 nucleotide sequences (using 306 nucleotides from the 5' region of the P1 gene). The Pic3 and V20 isolates (PVYO Wilga type both) cluster inside a "O-N" group. The Mexican isolates are in italics. Left to right: nucleotides from whole P1 gen of compared sequences (1 to 825 nt).
