Amorpha-4, 11-diene synthase catalyses the first probable step in artemisinin biosynthesis - Bouwmeester, H J; Wallaart, T E; Janssen, M HA; van Loo, B; Jansen, B JM; Posthumus, M A; Schmidt, C O; De Kraker, J W; König, W A; Franssen, M CR (Phytochemistry, 1999)