1. Computational Biology Team, Biological Science Division, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
2. Faculty of Chemistry, Biological and Chemical Research Center, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
3. Theoretical Biology and Biophysics Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. New Mexico Consortium, Los Alamos, New Mexico 87544, United States