About the Authors

Claudia Baltzer

Affiliations Department of Biology, ETH Zurich, Zurich, Switzerland, PhD program in Molecular Life Sciences, Zurich, Switzerland

Stefanie K. Tiefenböck

Affiliations Department of Biology, ETH Zurich, Zurich, Switzerland, PhD program in Molecular Life Sciences, Zurich, Switzerland

Mark Marti

Current address: Kantonsschule Willisau, Willisau, Switzerland

Affiliation Department of Biology, ETH Zurich, Zurich, Switzerland

Christian Frei

Christian.frei@cell.biol.ethz.ch

Affiliation Department of Biology, ETH Zurich, Zurich, Switzerland

Competing Interests

The authors have declared that no competing interest exists.

Author Contributions

Conceived and designed the experiments: CB CF. Performed the experiments: CB SKT CF. Analyzed the data: CB SKT CF. Contributed reagents/materials/analysis tools: CB SKT MM. Wrote the paper: CB CF.