[1] Flanders Interuniv Inst Biotechnol VIB, Lab Mol Canc Biol, B-9052 Ghent, Belgium
[2] Free Univ Brussels, ULB, IBMM, Unit Mol Embryol, Gosselies, Belgium
[3] European Inst Oncol, Dept Expt Oncol, I-20141 Milan, Italy
[4] FIRC, Inst Mol Oncol, I-20139 Milan, Italy