1. Science
for Life Laboratory, Department of Cell and Molecular Biology, Uppsala University, BMC Box 596, Uppsala S-751 24, Sweden
2. Institute
of Complex Systems: Structural Biochemistry, Forschungszentrum Jülich, Jülich 52425, Germany
3. Institute
of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf, Universitätsstrasse 1, Düsseldorf 40225, Germany
4. Department
of Chemistry, University at Buffalo, SUNY, Buffalo, New York 14260-3000, United States