1. Ludwig Institute for Cancer Research; Brussels Belgium
2. de Duve Institute, Université Catholique de Louvain; Brussels Belgium
3. Cliniques Universitaires St-Luc, Université Catholique de Louvain; Brussels Belgium
4. Center for Structural Biology, Department of Biochemistry and Cell Biology, Stony Brook University; Stony Brook NY USA
5. INSERM, U1009, Université Paris-Sud, Institut Gustave Roussy; Villejuif Cedex France