About the Authors
Departments of Chemistry and Biochemistry and Biophysics, Texas A&M University, College Station, Texas, United States of America
Department of Mathematics, University of Houston, Houston, Texas, United States of America
The authors have declared that no competing interests exist.
Wrote the paper: PL. Developed model and performed the numerical analysis: IS. Analyzed the mathematics associated with the model: JM. Held discussions during model development: PL.