1. Institute of Neurology (Edinger Institute) and Institute for Cardiovascular Regeneration, Johann Wolfgang Goethe University Frankfurt Medical School, 60590 Frankfurt am Main, Germany
2. Institute of Ophthalmology–Cell Biology, University College London, London EC1V 9EL, England, UK
3. Division of Experimental and Translational Oncology, Department of Internal Medicine, Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany
4. Department of Pharmacology, Graduate School of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan