1. Section of Islet Transplantation and Cell Biology (T.K., I.E.K., W.N., S.S., S.B.-W., G.W., A.S.), Boston, Massachusetts 02215
2. Joslin Diabetes Center, and Department of Medicine (T.K., I.E.K., W.N., P.G., G.K., S.B.-W., G.W., A.S.), Harvard Medical School, Boston, Massachusetts 02215
3. Diabetes and Obesity Research Program (D.R.L.), Garvan Institute of Medical Research, St. Vincent’s Hospital, Sydney, New South Wales 2010, Australia
4. Section on Vascular Cell Biology (P.G., G.K.), Boston, Massachusetts 02215