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Quantitative RT-PCR analysis of the four OSC genes in K. daigremontiana leaves generating pentacyclic triterpenoids. The relative expression levels were determined in whole, still growing leaves and normalized (n = 3, S.D. (error bars)). Lupeol synthase was found to be expressed most actively, taraxerol synthase at an intermediate level, and glutinol as well as friedelin synthase least of the genes.
