1. Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK.
2. Epigenetics Programme, Babraham Institute, Cambridge CB22 3AT, UK.
3. Centre for Trophoblast Research, University of Cambridge, Cambridge CB2 3EG, UK.
4. Proteomics Research Group, Babraham Institute, Cambridge CB22 3AT, UK.
5. Bioinformatics Group, Babraham Institute, Cambridge CB22 3AT, UK.
6. School of Clinical Medicine, University of Cambridge, Cambridge CB2 0SP, UK.
7. Cancer Research UK, Cambridge Research Institute, Li Ka Shing Centre, Cambridge CB2 0RE, UK.