1. Department
of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
2. Raytheon BBN Technologies, 10
Moulton Street, Cambridge, Massachusetts 02138, United States
3. Bioinformatics
Division/Center for Synthetic and Systems Biology, Tsinghua National
Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, China