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The growth of parent P. purpurogenum G59 strain and its mutant 3-f-31 on PDA plates by incubation at 28 °C for different times (day) after treatment of their spores with neomycin. Fresh G59 and 3-f-31 spores were treated with 5.0 mg/mL neomycin in 50% aqueous DMSO at 4 °C for 15 days, as done for selecting the mutant, and each 50 μL portion of the treated spore suspensions was spread on PDA plates, incubated at 28 °C, and photographed at the given incubation times (day).
