1. Vernalis Ltd., Granta Park, Great Abington, Cambridge CB21 6GB, U.K.
2. Novartis Institutes for Biomedical Research, Novartis Pharma AG, CH-4002 Basel, Switzerland
3. Cancer Research UK Centre for Cancer Therapeutics, The Institute of Cancer Research, Haddow Laboratories, Sutton, Surrey SM2 5NG, U.K.