1. Division of Cell Biology, The Netherlands Cancer Institute Plesmanlaan 121 1066CX Amsterdam The Netherlands
2. Division of Cellular Biochemistry and Centre of Biomedical Genetics, The Netherlands Cancer Institute Plesmanlaan 121 1066CX Amsterdam The Netherlands
3. Department of Physiological Chemistry and Centre of Biomedical Genetics, UMCU Universiteitsweg 100 3584 CG Utrecht The Netherlands
4. Dulbecco Telethon Institute, Venetian Institute of Molecular Medicine Via Orus 2 35124 Padva Padova Italy