1. Department of Developmental Genetics, Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany.
2. Department of Genome Regulation, Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany.
3. Max Delbrück Center for Molecular Medicine and Berlin Institute of Health, 10115 Berlin, Germany.
4. Microscopy and Cryo-Electron Microscopy, Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany.
5. Sequencing Core Facility, Max Planck Institute for Molecular Genetics, 14195 Berlin, Germany.
6. Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA 02138, USA.
7. Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.
8. Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany.
9. Institute for Medical Genetics, Charité–University Medicine Berlin, Campus Benjamin Franklin, 12203 Berlin, Germany.