1. Division of Histology and Embryology; Medical University of Innsbruck; Müllerstrasse 59 A-6020 Innsbruck Austria
2. Division of Cell Biology, Biocenter; Medical University of Innsbruck; Innrain 80-82 A-6020 Innsbruck Austria
3. Current address: Department for Trauma Surgery; Medical University of Innsbruck; Anichstrasse 35 A-6020 Innsbruck Austria
4. Department of Therapeutic Radiology and Oncology; Medical University of Innsbruck; Anichstrasse 35 A-6020 Innsbruck Austria
5. Research Institute for Biomedical Aging Research; University of Innsbruck; Rennweg 10 A-6020 Innsbruck Austria