1. Biosciences and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
2. Biochemistry and Molecular Biology Department, Georgetown University, Washington, DC 20057, United States
3. Applications, Simulations, and Quality Division, Computation Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States