1. Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich , Switzerland
2. National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva 84105 , Israel
3. Department of Life Sciences, Ben-Gurion-University of the Negev, Beer-Sheva 84105 , Israel
4. Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105 , Israel