1. Department of Cell Biology, Cell microscopy Centre, UMC Utrecht, Heidelberglaan; Utrecht The Netherlands
2. Hubrecht Institute for Stem Cell and Developmental Biology; Utrecht The Netherlands
3. Biotechnology Institute Thurgau Unterseestrasse; Kreuzlingen Switzerland
4. Department of Biology, University of Konstanz; Konstanz Germany
5. German Cancer Research Center (DKFZ), Division Signaling and Functional Genomics and University of Heidelberg, Cell and Molecular Biology, Medical Faculty Mannheim, Division Signaling and Functional Genomics, Im Neuenheimer Feld; Heidelberg Germany