About the Authors

Emre Yaksi

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

Benjamin Judkewitz

¤ Current address: Wolfson Institute for Biomedical Research and Department of Physiology, University College London, Gower Street, London, United Kingdom

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

EY performed most of the experiments, with the help of BJ and RWF. RWF conceived the study, constructed equipment, wrote data analysis software, participated in experiments and data analysis, and wrote the manuscript with assistance from EY and BJ.