1. Department of Neuroscience; Erasmus Medical Centre; Rotterdam The Netherlands
2. Department of Cell Biology; Faculty of Science; University of Utrecht; Utrecht The Netherlands
3. Institut du Fer à Moulin, INSERM U839, Université Pierre et Marie Curie-Paris 6; UMR S839 Paris France
4. Centre for Neuroscience, Swammerdam Institute for Life Sciences, Faculty of Science, University of Amsterdam; Amsterdam The Netherlands