1 Institute of Pharmacology and Toxicology, University of Zurich; Neuroscience Center Zurich, University and ETH Zurich, Zürich, Switzerland; Former address: Institute of Neuronal Cell Biology; Department of Neurology, Technische Universität München, Munich, Germany.
2 Institute of Pharmacology and Toxicology, University of Zurich; Neuroscience Center Zurich, University and ETH Zurich, Zürich, Switzerland.