1. Department of Biological Chemistry; The John Innes Centre; Colney Lane Norwich UK
2. Current address: Department of Biology; University of York; York YO10 5YW UK
3. Independent Junior Research Group, Biosynthetic Design of Natural Products; Leibniz Institute for Natural Product Research and Infection Biology, Hans Knöll Institute (HKI Jena); Beutenbergstr. 11a 07745 Jena Germany