1Imperial Cancer Research Fund, Lincoln’s Inn Fields, London WC2A 3PX, United Kingdom
2Present address: Department of Haematology/Oncology, University of Freiburg Medical Center, 79106 Freiburg, Germany.
3Present address: CMB, Scheelevägen 12A, Astra Draco Lund, 22100 Lund, Sweden
4Royal Postgraduate Medical School, Hammersmith Hospital, Department of Histopathology, London W12 0HS, United Kingdom
5National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
6Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115
7Present address: Department of Pediatrics, Johannes-Gutenberg-University, 55101 Mainz, Germany
8Life Sciences Division, Oak Ridge National Laboratory, 1060 Commerce Park Drive Oak Ridge, Tennessee 37830–6480