Author information:
(1)Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Harvard-MIT 
Division of Health Sciences and Technology, Cambridge, MA 02139, USA.
(2)Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.
(3)Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Department of 
Systems Biology, Harvard Medical School, Boston, MA 02115, USA.
(4)Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Computational 
and Systems Biology, Massachusetts Institute of Technology, Cambridge, MA 02140, 
USA.
(5)Department of Cellular and Molecular Pharmacology, California Institute of 
Quantitative Biosciences, Center for RNA Systems Biology, University of 
California, San Francisco, San Francisco, CA 94158, USA.
(6)Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Department of 
Systems Biology, Harvard Medical School, Boston, MA 02115, USA; Department of 
Biology, Massachusetts Institute of Technology, Cambridge, MA 02140, USA.
(7)Department of Cellular and Molecular Pharmacology, California Institute of 
Quantitative Biosciences, Center for RNA Systems Biology, University of 
California, San Francisco, San Francisco, CA 94158, USA; Howard Hughes Medical 
Institute, Chevy Chase, MD 20815, USA.
(8)Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; School of 
Engineering and Computer Science and Institute of Life Sciences, The Hebrew 
University of Jerusalem, Jerusalem 91904, Israel.
(9)Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Department of 
Biology, Massachusetts Institute of Technology, Cambridge, MA 02140, USA; Howard 
Hughes Medical Institute, Chevy Chase, MD 20815, USA. Electronic address: 
aregev@broadinstitute.org.