1. Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA.
2. Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA.
3. Whitehead Institute for Biomedical Research, Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.
4. Department of Biology, Howard Hughes Medical Institute, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.
5. Broad Institute, Cambridge, MA 02142, USA.
6. The David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.