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A. A phenotypic variant (PV) colony of strain M6 after 72 h of growth in NA. PV colonies of strain 7a1 have a similar appearance when observed at the naked eye. B. Binocular observation of 72-h colonies (grown on NA) of parental strains M6 and 7a1 and two variants of each strain, M6V1 and M6V2, and 7a1V1 and 7a1V2 (the same magnification was used for all colonies). C. Phenotypic variation during growth of an A. citrulli M6 colony.
