1. Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel
2. Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
3. Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany
4. Cell Morphogenesis and Signal Transduction, DKFZ-ZMBH Alliance and German Cancer Research Center (DKFZ), Heidelberg, Germany