[1] MIT, Dept Biol, Cambridge, MA 02142 USA
[2] Broad Inst MIT & Harvard, Cambridge, MA 02142 USA
[3] Harvard Univ, Fac Arts & Sci, Ctr Syst Biol, Dept Mol & Cellular Biol,Howard Hughes Med Inst, Cambridge, MA 02138 USA
[4] Harvard Univ, Fac Arts & Sci, Ctr Syst Biol, Dept Chem,Howard Hughes Med Inst, Cambridge, MA 02138 USA
[5] Harvard Univ, Fac Arts & Sci, Ctr Syst Biol, Dept Biol Chem,Howard Hughes Med Inst, Cambridge, MA 02138 USA