1. Departments of Molecular Cell Biology and Physics of Complex Systems, Weizmann Institute of Science, Rehovot, 76100, Israel.
2. Centre for Non-linear Dynamics, Department of Physiology, McGill University, 3655 Promenade Sir William Osler, Montréal, Québec, Canada, H3G 1Y6.
3. Division of Biology and Department of Applied Physics, Caltech, Pasadena, CA 91125, USA.