1Broad Institute of MIT and Harvard, 7 Cambridge Center, Cambridge, MA 02142, USA, and McGovern Institute for Brain Research, Department of Brain and Cognitive Sciences, Department of Biological Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.
2Program in Biological and Biomedical Sciences, Harvard Medical School, Boston, MA 02115, USA
3Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138 USA
4Harvard-MIT Health Sciences and Technology, Harvard Medical School, Boston, MA 02115, USA
5School of Life Sciences, Tsinghua University, Beijing 100084, China
6Department of Biochemistry and Molecular Biophysics, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
7Computational and Systems Biology Graduate Program and Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
8Laboratory of Bacteriology, The Rockefeller University, 1230 York Avenue, New York, NY 10065, USA
