1. CRUK p53 Signal Transduction Group, Cell Signalling Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh EH4 2XR, School of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, Ninewells Medical School, University of Dundee, Dundee DD1 9SY, and Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom