1. Faculty of Arts and Sciences (FAS) Center for Systems Biology, Harvard University, 52 Oxford Street, Cambridge, MA 02138, USA.
2. Department of Biological Engineering, Massachusetts Institute of Technology (MIT), 40 Ames Street, Cambridge, MA 02142, USA.
3. Department of Biosystems Science and Engineering, Eidgenössische Technische Hochschule (ETH) Zürich, Mattenstrasse 26, Basel 4058, Switzerland.
4. Department of Electrical Engineering and Computer Science, MIT, 40 Ames Street, Cambridge MA 02142, USA.