1. Howard Hughes Medical Institute, Harvard University, Cambridge, MA 02138, USA.
2. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.
3. Department of Physics, Harvard University, Cambridge, MA 02138, USA.
4. Center for Brain Science, Harvard University, Cambridge, MA 02138, USA.
5. Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.
6. Klarman Cell Observatory, Broad Institute of MIT and Harvard, Cambridge, MA 02139, USA.
7. Koch Institute of Integrative Cancer Biology, Department of Biology, MIT, Cambridge, MA 02139, USA.