[1] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
[2] Tech Univ, Med Fac Carl Gustav Carus, Dresden, Germany
[3] Harvard Univ, Phys, Cambridge, MA 02138 USA
[4] Harvard Univ, Mol & Cellular Biol, Cambridge, MA 02138 USA
[5] Harvard Univ, Ctr Syst Biol, Cambridge, MA 02138 USA