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"Inhibition of later steps in the ergosterol-biosynthetic pathway by ketoconazole, an inhibitor of the lanosterol-14alpha-demethylase, and U18666A, an inhibitor of the squalene-2,3-epoxide-lanosterol cyclase, also induce expression of ERG1, suggesting that ERG1 expression is positively regulated by diminished intracellular ergosterol levels."