1. Section of Cell Biology, Division of Diabetes, Endocrinology and Metabolism, Department of Medicine (D.J.H, A.I.T., S.G.B., R.K.M., N.R.J., S.H., M.C.C., G.A.R.), Imperial College London, London W12 0NN, United Kingdom
2. Department of Endocrinology and Metabolism (M.B., P.M.), University of Pisa, 56126 Pisa, Italy
3. Cell Isolation and Transplantation Center, Department of Surgery (D.B.), Geneva University Hospitals and University of Geneva, 1205 Geneva, Switzerland
4. Oxford Centre for Diabetes, Endocrinology, & Metabolism (P.R.J., S.J.H.), University of Oxford, Oxford OX3 7LE, United Kingdom
5. NIHR Oxford Biomedical Research Centre (P.R.J., S.J.H.), Churchill Hospital, Oxford OX3 7LE, United Kingdom
6. Nuffield Department of Surgical Sciences (P.R.J., S.J.H.), University of Oxford, Oxford OX3 9DU, United Kingdom