1. Department
of Chemistry and Biochemistry, University of California Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1569, United States
2. Molecular
Microscopy Research Group, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747
AG Groningen, The Netherlands
3. Laboratory
of Biophysics, Wageningen University and Research, Dreijenlaan
3, 6703 HA Wageningen, The Netherlands
4. Microspectroscopy
Centre, Wageningen University and Research, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands