1. Institute of Functional Epigenetics, Helmholtz Zentrum München 1 , 85764 Neuherberg , Germany
2. John Innes Centre 2 Department of Cell and Developmental Biology , , Norwich, NR4 7UH , UK
3. Institute of Cancer Research 3 Department of Cancer Biology, Chester Beatty Laboratories , , London, SW3 6JB , UK
4. KU Leuven, Campus Gasthuisberg O&N1bis gebouw 402-20 4 Department of Cellular and Molecular Medicine , , Herestraat 49, B-3000 Leuven , Belgium
5. Institute for the Physics of Living Systems, University College London 5 Department of Physics and Astronomy , , London, WC1E 6BT , UK
6. The Company of Biologists 6 , 94 Station Road, Histon, Cambridge, CB24 9LF , UK
7. University of California, Berkeley 7 Molecular and Cell Biology Department , , Berkeley, CA 94720-3200 , USA
8. Stanford University 8 Department of Biology , , Stanford, CA 94305 , USA