1. Global Security Computing Applications Division, Lawrence Livermore National Laboratory , Livermore, CA 94550, United States
2. Center for Computational Biology, University of California Berkeley , Berkeley, CA 94720, USA
3. Department of Systems Biology, Columbia University , New York, NY 10023, United States
4. Biosciences & Biotechnology Division, Lawrence Livermore National Laboratory , Livermore, CA 94550, United States