1. Institute of Medical Sciences, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen AB25 2ZD, UK
2. Euan Macdonald Centre for Motor Neurone Disease Research, University of Edinburgh, Edinburgh EH16 4SB, UK
3. Hannover Medical School, Institute of Neuroanatomy and Cell Biology, Hannover 30625, Germany
4. Center for Systems Neuroscience (ZSN) Hannover, University of Veterinary Medicine Hannover, Hannover 30559, Germany
5. Edinburgh Medical School: Biomedical Sciences, College of Medicine & Veterinary Medicine, University of Edinburgh, Edinburgh EH8 9AG, UK
6. Anatomy Facility, School of Life Sciences, University of Glasgow, University Avenue, Glasgow G12 8QQ, UK