1. Department of Materials and Interfaces; Weizmann Institute of Science; Rehovoth 76100 Israel
2. Department of Structural Biology; Weizmann Institute of Science; Rehovoth 76100 Israel
3. Department of Chemical Research Support; Weizmann Institute of Science; Rehovoth 76100 Israel
4. Departments of Molecular Cell Biology and of Physics of Complex Systems; Weizmann Institute of Science; Rehovoth 76100 Israel