Effect of propionyl-CoA-forming amino acids on conidial pigmentation. FGSC26 (wild type), RYQ11 (ΔmcsA), RYQ25.1 (ΔmcsA/ΔpcsA), and TYQ4.24 (ΔpcsA) were grown in GMM with 50 mm d,l-arginine and d,l-methionine and 25 mm l-isoleucine and l-valine substituted in place of sodium nitrate as the nitrogen source for 2 days. Amino acids were purchased from Sigma-Aldrich.