Fig. 2

Colony phenotype and microscopic morphology of the parent strain M. ruber SRZ112 (A) and the developed mutant M. ruber SRZ112—m22 (B). Colony growth was observed on Czapek–Yeast autolysate agar after incubation for 10 days at 25 °C. The appearance of both strains was studied under the light microscope after staining with lactophenol cotton blue