1. Laboratory of Tumor Biology and PharmacologyCNRS UMR 8532Institut Gustave‐RoussyVillejuif94805CedexFrance
2. Department of Pharmaceutical Technology and BiochemistryTechnical University of Gdansk80‐952GdanskPoland
3. CNRSStation Biologique BP 74Roscoff29682CedexBretagneFrance
4. Department of Cell BiologyUniversity of OklahomaOklahoma CityOklahoma