Fig. 1From: Parthenolide production in cell suspension culture of feverfewPresumed biosynthetic pathway of parthenolide; step 1 is catalyzed by germacrene A synthase; steps 2, 3 and 4 are catalyzed by germacrene A oxidase; step 5a, 5b, costunolide synthase; and step 6, costunolide epoxidase/parthenolide synthase (Majdi et al. 2011)Back to article page