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Expression analysis of triterpene biosynthetic genes (a, Malus × domestica OXIDOSQUALENE CYCLASE1 (MdOSC1); b, MdOSC3; c, MdOSC4; d, MdOSC5; e, CYP716A175) by real‐time quantitative (q)PCR on RNA extracted from apple skin tissues. The normalized relative expression was rescaled to the sample with the lowest relative expression, that is, the expression level was set to 1 in the cultivar ‘Topaz’ for MdOSC4. Error bars show SD (n = 3).
