1. Department of Anatomy, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
2. Minerva Foundation Institute for Medical Research, 00290 Helsinki, Finland
3. Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Academy of Sciences of the Czech Republic, 166 10 Prague, Czech Republic
4. Laboratory of Physics, Tampere University of Technology, 33101 Tampere, Finland
5. Biochemistry, Faculty of Science and Engineering, Åbo Akademi University, 20520 Turku, Finland
6. Department of Chemistry and Biochemistry, Queens College, City University of New York, Flushing, New York 11367, United States
7. Department of Physics, University of Helsinki, 00014 Helsinki, Finland