Colony phenotype on agar plates, number of conidia, and biomass formation in experimental cultures of histone H3 mutant strains of A. nidulans. (A) Growth phenotype. The mutant strains were grown on AMM agar plates for 3 days at 37°C. (B) Number of conidia produced by the different strains. Fresh conidia were plated on AMM agar plates, and conidia were harvested after 3 days of incubation at 37°C. Statistical significance of data is given by the P value (**, P < 0.01; ***, P < 0.001). (C) Biomass formation in experimental cultures after 24 h of cultivation at 37°C in 20 ml of AMM.