1. Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843-3122, United States
2. Institut
für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, 40204 Düsseldorf, Germany
3. Institute
of Structural Biochemistry (ICS-6), Research Centre Jülich, 52425 Jülich, Germany