1. Independent Junior Research Group Molecular Biology of Archaea, Max-Planck-Institute for Terrestrial Microbiology, Karl-von-Frisch-Strasse, 35043 Marburg, Germany
2. Department of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, and the Zernike Institute for Advanced Materials, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands
3. Universitaet Regensburg, Centre for Electron Microscopy, Institute for Anatomy, Universitaetsstr. 31, 93053 Regensburg, Germany