1. DNA Damage Response Laboratory, Clare Hall, London Research Institute, South Mimms EN6 3LD, UK.
2. Wellcome Trust Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee DD1 5EH, UK.
3. The Gurdon Institute and Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1QN, UK.
4. Cancer Research UK, Paterson Institute for Cancer Research, University of Manchester, Manchester M20 4BX, UK.
5. Genetic Recombination Laboratory, Clare Hall, London Research Institute, South Mimms EN6 3LD, UK.
6. Protein Analysis and Proteomics Laboratory, Clare Hall, London Research Institute, South Mimms EN6 3LD, UK.