University of Oslo - Centre for Molecular Medicine Norway, University of Oslo - Centre for Molecular Medicine Norway, University of Oslo - Centre for Molecular Medicine Norway, University of Oslo - GliaLab and Letten Centre, University of Freiburg - Laboratory of Clinical Biochemistry and Metabolism, University of Oslo - Centre for Molecular Medicine Norway, University of Oslo - Centre for Molecular Medicine Norway, Ludwig Institute for Cancer Research, University of Oslo - Centre for Molecular Medicine Norway, University of Oslo - Department of Pathology, University of Oslo - GliaLab and Letten Centre, University of Freiburg - Laboratory of Clinical Biochemistry and Metabolism, Catholic University of Louvain (UCL) - Department of Ophthalmology, University of Oslo - Centre for Molecular Medicine Norway and University of Oslo - Centre for Molecular Medicine Norway