1. Department of Chemistry; University of Turku, Turku, Joint Biotechnology Laboratory, Arcanum; Vatselankatu 2 Turku 20500 Finland
2. Department of Chemistry and Biotechnology; Swedish University of Agricultural Sciences; Uppsala BioCentre, P.O. BOX 7016 Uppsala 75007 Sweden
3. Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine; The Sahlgrenska Academy, University of Gothenburg; P.O. BOX 440 Göteborg 40530 Sweden
4. Department of Biochemistry/Biotechnology; University of Turku; Tykistökatu 6A Turku 20014 Finland