1. Department of Physics, Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (UNESP), São José do Rio Preto, São Paulo 15054-000, Brazil
2. Center for Theoretical Biological Physics, Rice University, Houston, Texas 77005, United States
3. Departments of Physics and Astronomy, Chemistry, and Biosciences, Rice University, Houston, Texas 77005, United States