1. Department of Theoretical Biology and Biophysics, Los Alamos National Lab, MS-K710, P.O.
Box 1663, Los Alamos, New Mexico 87545-0001, United States
2. Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, SLSRC, Rm 1000, Norman, Oklahoma 73019-5251, United States
3. Pharmacology and Physiological Science, School of Medicine, Saint Louis University, Schwitalla Hall, Room M362, St. Louis, Missouri 63104, United States