1. Institute of Neuroscience and Medicine, INM-2, Research Centre Jülich, D-52425 Jülich, Germany
2. Current address: Department of Translational Neuroscience, Brain Center Rudolf Magnus, University Medical Center Utrecht, 3508 AB Utrecht, The Netherlands
3. Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
4. Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, D-52074 Aachen, Germany
5. Jülich-Aachen Research Alliance-Brain, Translational Brain Medicine, D-52074 Aachen, Germany