About the Authors
Section of Molecular Cytology, Centre for Advanced Microscopy, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JG TG. Performed the experiments: JG JV Lv. Analyzed the data: JG TG. Contributed reagents/materials/analysis tools: JV MA Lv TG. Wrote the paper: JG TG.