1. Division of Cellular Biochemistry and Center for Biomedical Genetics
2. Division of Molecular Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
3. Hubrecht Laboratory, Netherlands Institute for Developmental Biology, 3584 CT Utrecht, The Netherlands
4. INSERM U586, Unité de Recherches sur les Obésités, 31432 Toulouse, France
5. CRUK Institute for Cancer Studies, Birmingham University, Birmingham B15 2TT, United Kingdom