] c -increasing agents) on in vitro stalk cell formation in several strains. DMO, in combination with Tg or BHQ, induced stalk cell formation in a DIF-deficient mutant HM44. Although the rates of stalk cell induction by the drugs were low in the presence of cerulenin (an inhibitor of endogenous DIF production) in HM44 and V12M2 (a wild-type strain), the drugs succeeded in inducing sufficient stalk cell formation when a small amount of DIF-1 was supplied. Furthermore, co-addition of DMO, BHQ and a small amount of DIF-1 also induced sufficient stalk cell formation in AX-4 (an axenic strain) and HM1030 (dmtA
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