About the Authors
Institute for Biochemistry and Genetics, Department of Biomedicine, University of Basel, Basel, Switzerland
Biozentrum, University of Basel, Basel, Switzerland
The authors have declared that no competing interests exist.
The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: DF OP. Performed the experiments: DF LF HW KM FM EF. Analyzed the data: DF LF OP. Contributed reagents/materials/analysis tools: ML PS. Wrote the paper: OP.