A.M.J.S. holds a Canada Research Chair in Regenerative Medicine and Transplantation Surgery, and receives funding from the Canadian Stem Cell Network, the Juvenile Diabetes Research Foundation, the Diabetes Research Institute Foundation of Canada and the University Hospital Foundation. He consults for ViaCyte Inc., Protokinetix Inc., Hemostemix Inc. and Aspect Biosystems Ltd. K.V. declares no competing interests.