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The relationship in plaque size and sequence proximity of between 35 field isolates defined as VLVs and the vaccine strains (MLV and ATP) or their wild-type parental strains (VR2332 and JA142). The horizontal solid line at 2 mm of plaque size indicates the minimum size for medium-sized plaques. The vertical dotted lines at 0% indicate that the virus on the line is located at the identical genetic distance from both viruses. AA, amino acid.
