About the Authors
Department Biologie II, Ludwig-Maximilians-Universität München, Planegg-Martinsried, Germany
The authors have declared that no competing interests exist.
UF, MS, JEG, and LW conceived and designed the experiments. UF and MS performed the experiments. UF, MS, and LW analyzed the data. GS contributed reagents/materials/analysis tools. UF, MS, and LW wrote the paper.