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Phase-contrast microscopy of the Pspo mutant (SKK968) and the wild-type strain of S. griseus after 16 h of sporulation induced by phosphate starvation. (A) Spore chains were evident in the sporogenic hyphae of the wild-type strain. (B) No sporulation septation was found from the sporogenic hyphae of the mutant. The bar represents 10 μm. No differences in vegetative cultures of the mutant and wild-type strains were apparent.
