1 Samantha Dickson Brain Cancer Unit, UCL Cancer Institute, London, WC1E 6DD, UK.
2 MRC Laboratory for Molecular Cell Biology, University College London, Gower Street, London, WC1E 6BT, UK.
3 Division of Neuropathology, National Hospital for Neurology and Neurosurgery, University College London NHS Foundation Trust, Queen Square, WC1N 3BG, London, UK.
4 Department of Neurodegenerative Disease, UCL Institute of Neurology, Queen Square, WC1N 3BG, London, UK.
5 MRC Centre for Regenerative Medicine and Edinburgh Cancer Research UK Cancer Centre, University of Edinburgh, 5 Little France Drive, Edinburgh, EH16 4UU, UK.
6 Division of Neurosurgery, Arthur and Sonia Labatt Brain Tumor Research Center, Departments of Surgery and Molecular Genetics, Hospital for Sick Children, Toronto, ON, M5G 1X8, Canada.
7 MRC London Institute of Medical Sciences, Du Cane Road, London, W12 0NN, UK.
8 Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, Du Cane Road, London, W12 0NN, UK.
9 Samantha Dickson Brain Cancer Unit, UCL Cancer Institute, London, WC1E 6DD, UK. s.parrinello@ucl.ac.uk.