Heiko Heerklotz1, Sandro Keller2. 1. Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada. Electronic address: heiko.heerklotz@utoronto.ca. 2. Molecular Biophysics, University of Kaiserslautern, Kaiserslautern, Germany; Institute for Medicqal Physics and Biophysics, University of Leipzig, Leipzig, Germany. Electronic address: mail@sandrokeller.com.