1. Department of Cell and Developmental Biology, Max Planck Institute for Molecular Biomedicine; Münster Germany
2. University of Münster, Institute of Physiology I; Münster Germany
3. Institute of Experimental Epilepsy Research; Münster Germany
4. Present address: Department of Stem Cell Biology, School of Medicine, SMART Institute of Advanced Biomedical Science, Konkuk University; Hwayang-dong, Gwangjin-gu Seoul Republic of Korea
5. University of Münster, Medical Faculty; Münster Germany