1. Koch Institute for Integrative Cancer Research, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
2. Research Institute of Molecular Pathology, Dr. Bohr-Gasse 7, A-1030 Vienna, Austria.
3. Division of Molecular Structure, Medical Research Council National Institute for Medical Research, The Ridgeway, London NW7 1AA, UK.
4. Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, I-20139 Milan, Italy.
5. Biozentrum, University of Basel, Klingelbergstrasse 50/70, CH-4056 Basel, Switzerland.
6. Department of Biochemistry, University of Leicester, Leicester LE1 9HN, UK.
7. Department of Biochemistry and Molecular Genetics, University of Virginia School of Medicine, Charlottesville, VA 22908, USA.
8. Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.