1. Max Planck Institute of Molecular Cell Biology and Genetics, 01307 Dresden, Germany
2. Max Planck Institute for the Physics of Complex Systems, 01307 Dresden, Germany
3. Center for Systems Biology Dresden, 01307 Dresden, Germany
4. Cluster of Excellence Physics of Life, TU Dresden, 01307 Dresden, Germany
5. Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
6. Department of Systems Biology, Harvard Medical School, Boston, MA 02115
7. Cell Division Group, Marine Biological Laboratory, Woods Hole, MA 02543
8. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139