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SUMMARY The prenols of Blakeslea trispora were found to be a mixture of C,,-C, prenols and a-dihydroprenols with C,o as the main type; the principal ubiquinones were ubiquinone-g and its (side-chain) dihydro-derivative. A minus strain contained higher levels of prenols, ubiquinones, ergosterol, and p-carotene than a plus strain, and the levels of all four types of isoprenoid were higher again in mated cultures. The overall increase in isoprenoid synthesis in mated cultures was sometimes tenfold but the different isoprenoid types were not all equally affected by the mating process ; possible roles for the different types in sexual differentiation are considered. General. The strains of Blakeslea trispora used were ~~~~2895 (plus) and 2896 (minus), and the culture procedures are fully described elsewhere (Bu'Lock & Winstanley, 1971). For the present work, shake cultures were grown on 10% commercial malt extract for

Prenols and Ubiquinones in Single-strain and Mated Cultures of Blakeslea trispora