1. University of Bayreuth, BZKG and BayColl, Gottlieb-Keim-Str. 60, 95448 Bayreuth, Germany
2. Friedrich-Schiller-University, Centre for Electron Microscopy, Ziegelmühlenweg 1, 07743 Jena, Germany
3. Shiseido Research Center, 2-2-1 Hayabuchi, Tsuzuki-ku, Yokohama, Japan 224-8558