1. Institute of Physics, University of Tartu, W. Ostwald Str. 1, 50411 Tartu, Estonia
2. Institut Laue Langevin, F-38042 Grenoble Cedex 9, France
3. University Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
4. Department of Molecular Biology and Biotechnology, University of Sheffield, S10 2TN Sheffield, U.K.
5. Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia