1. Department of Tumour Biology, Cancer Research UK Clinical Centre, Bart's and the London Queen Mary's School of Medicine and Dentistry, London EC1M 6BQ, England, UK
2. Protein Phosphorylation Laboratory, Cancer Research UK London Research Institute, London WC2A 3PX, England, UK, and Division of Cancer Studies, King's College School of Medicine, Guy's Hospital, London SE1 9RT, England, UK