About the Authors

Rico Tabor

Affiliation Department of Biomedical Optics, Max-Planck-Institute for Medical Research, Heidelberg, Germany

Rainer W. Friedrich

To whom correspondence should be addressed. E-mail: Rainer.Friedrich@fmi.ch

Affiliations Department of Biomedical Optics, Max-Planck-Institute for Medical Research, Heidelberg, Germany, Friedrich-Miescher-Institute, Basel, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RF. Performed the experiments: RT. Analyzed the data: RT. Contributed reagents/materials/analysis tools: RF. Wrote the paper: RF RT.