1. Institute of Zoology, RWTH Aachen University, Aachen 52074, Germany
2. Department of Biological Science, Macquarie University, Sydney 2109, Australia
3. Institute of Applied Physics, Johannes Kepler University Linz, Linz 4040, Austria
4. Research Institute for Precious Metals and Metals Chemistry, Schwaebisch Gmuend 73525, Germany
5. Central Facility for Electron Microscopy, RWTH Aachen University, Aachen 52062, Germany
6. Department for Dimensional Nanometrology, Physikalisch-Technische Bundesanstalt, Berlin 10587, Germany
7. Institute of Biomedical Mechatronics, Johannes Kepler University Linz, Linz 4040, Austria