Affiliation: | 1. Wellcome-MRC Cambridge Stem Cell Institute, University of Cambridge, Cambridge CB2 1QR, UK;2. Graduate Program in Areas of Basic and Applied Biology, Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, 4050-313 Porto, Portugal;3. Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK;4. Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3EG, UK |