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Grouping of wild and siRNA-induced mutant PPRV strains according to their nucleotide mutation features. Coordinates of each PPRV strain were computed using a multiple-factor analysis. Each strain is represented by a dot on the factorial plane (axis 2, axis 3). Each group centroid is represented by a letter, M for siRNA-induced mutant PPRV strains and W for wild PPRV strains. Group membership is represented by a line segment joining each PPRV strain to its group centroid.
