1. Department of Biochemistry and Biophysics, Arrhenius Laboratories, Stockholm University, 106 91 Stockholm, Sweden
2. Department of Environmental Science and Analytical Chemistry, Arrhenius Laboratories, Stockholm University, 106 91 Stockholm, Sweden
3. Department of Cell and Molecular Biology, Uppsala University, 751 24 Uppsala, Sweden
4. The National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia
5. Institute of Complex Systems: Structural Biochemistry, Forschungszentrum Jülich, 52425 Jülich, Germany