1. Department of Biochemistry, Biocenter Oulu, University of Oulu, Linnanmaa, P.O. Box 3000, FIN-90014 Oulu, Finland
2. Department of Pathology, Biocenter Oulu, University of Oulu, Linnanmaa, P.O. Box 3000, FIN-90014 Oulu, Finland
3. Departement Moleculaire Celbiologie, Katholieke Universiteit Leuven, Campus Gasthuisberg, Afdeling Farmakologie, Herestraat 49 (box 601), B-3000 Leuven, Belgium