About the Authors
Groningen Biomolecular Sciences and Biotechnology Institute & Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
The authors have declared that no competing interests exist.
Conceived and designed the experiments: CAL AHdV SJM. Performed the experiments: CAL. Analyzed the data: CAL AHdV SJM. Contributed reagents/materials/analysis tools: CAL SJM. Wrote the paper: CAL SJM.