1. Laboratory of the Department of Oncology, 54B1 Copenhagen University Hospital Herlev, DK-2730 Herlev, Denmark.
2. Department of Physiology and Biophysics, University of Aarhus, DK-8000 Aarhus C, Denmark.
3. UMR 8121 CNRS, Institut Gustave-Roussy, F-94805 Villejuif, France.