Department of Mathematics and Statistics, University of Missouri-Kansas City, Missouri, United States of America.|Theoretical Biology and Biophysics Group, Los Alamos National Laboratory, Los Alamos, New Mexico, United States of America.|Theoretical Biology and Biophysics Group, Los Alamos National Laboratory, Los Alamos, New Mexico, United States of America.|Division of Pharmacology, School of Pharmacy, University of Missouri-Kansas City, Missouri, United States of America.