1. Institute of Veterinary Anatomy, Department of Veterinary Medicine, Freie Universität Berlin, Germany
2. SFB 1112, Institute of Chemistry and Biochemistry - Physical and Theoretical Chemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Germany
3. Center for Medical Basic Research, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany