University of Basel - Embryology and Stem Cell Biology Lab, University of Lausanne - Swiss Institute of Bioinformatics (SIB), University of Basel - Embryology and Stem Cell Biology Lab, Yale University - Department of Neuroscience, Schleswig-Holstein University - Department of Neurosurgery, University of Lausanne - Swiss Institute of Bioinformatics (SIB) and University of Basel - Department of Biomedicine