1. Science for Life Laboratory, Box 1031, SE-171 21 Solna, Sweden
2. Department
of Biochemistry and Biophysics and Center for Biomembrane Research, Stockholm University, SE-106 91 Stockholm, Sweden
3. Department
of Computer Science, Department of Molecular and Cellular Physiology,
and Institute for Computational and Mathematical Engineering, Stanford University, Stanford, California 94305, United States