1. Department of Physiology, Anatomy and Genetics, South Parks Road, University of Oxford, Oxford OX1 3QX, UK.
2. Cancer Research UK Cambridge Institute, University of Cambridge, Li Ka Shing Centre, Robinson Way, Cambridge CB2 0RE, UK.
3. Howard Hughes Medical Institute, Janelia Research Campus, 19700 Helix Drive, Ashburn, VA 20147, USA.
4. European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Cambridge CB10 1SD, UK.
5. Institute of Epigenetics and Stem Cells, Helmholtz Zentrum München, D-81377 München, Germany.
6. Institute of Functional Epigenetics, Helmholtz Zentrum München, D-85764 Neuherberg, Germany.
7. Institute of Computational Biology, Helmholtz Zentrum München, D-85764 Neuherberg, Germany.
8. Wellcome Sanger Institute, Wellcome Genome Campus, Cambridge CB10 1SA, UK.