Amorpha-4,11-diene synthase catalyses the first probable step in artemisinin biosynthesis. - Bouwmeester,H.J.; Wallaart,T.E.; Janssen,M.H.A.; van Loo,B.; Jansen,B.J.M.; Posthumus,M.A.; Schmidt,C.O.; de Kraker,J.W.; Konig,W.A.; Fransen,M.C. (Phytochemistry, 1999)