1. Institute of Clinical Pharmacology and Toxicology (P.K., H.P., M.P., D.G.), Benjamin Franklin Medical Center, Freie Universität Berlin, 14195 Berlin, Germany
2. Benjamin Franklin Medical Center, Institute of Anatomy (M.S., G.S.-T.), Benjamin Franklin Medical Center, Freie Universität Berlin, 14195 Berlin, Germany
3. Space Biology Group (A.C.), ETH Zurich, 8005 Zurich, Switzerland
4. Klinik für Unfall und Wiederherstellungschirurgie (M.I.), Benjamin Franklin Medical Center, Freie Universität Berlin, 14195 Berlin, Germany
5. Dipartmento di Patologia e Medicina Sperimentale e Clinica, University of Udine Medical School (F.C.), 33100 Udine, Italy
6. Clinic of Nuclear Medicine, University of Regensburg (J.S., C.E.), 93042 Regensburg, Germany
7. Max Planck Institute of Biochemistry (J.B.), 82152 Martinsried, Germany