1. Department of Materials Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
2. Physics Department, Nuclear Research Centre, Negev, P.O. Box 9001, Beer-Sheva 84190, Israel
3. Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439
4. Laboratoire de Biogéosciences, UMR 5561, Université de Bourgogne, 6 Bd. Gabriel, 21000 Dijon, France
5. Department of Structural Biology, Weizmann Institute of Science, Rehovot 76100, Israel