Affiliation: | 1. MRC Clinical Sciences Centre, Imperial College London, Faculty of Medicine, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK;2. Institute for Stem Cell Research, University of Edinburgh, King’s Buildings, West Mains Road, Edinburgh EH9 3JQ, UK;3. Wellcome Trust Centre for Stem Cell Research, University of Cambridge, Tennis Court Road, Cambridge CB2 1QR, UK |