1 German Center for Neurodegenerative Diseases (DZNE), Dresden, Germany.
2 CRTD - Center for Regenerative Therapies TU Dresden, Dresden, Germany.
3 Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
4 Laboratory of Genetics, The Salk Institute, La Jolla, California, USA.