Gas chromatographic analysis of triterpenoids in yeast strains harboring the vectors indicated in the various panels. Triterpenoid alcohols were transformed into acetates prior to GC analysis. A and B were present in all yeast samples and were identified as epoxysqualene and ergosterol, respectively. Compounds 1–5 showed retention behavior similar to those of authentic standards of taraxerol, β-amyrin, glutinol, friedelin, and lupeol, respectively.