MDH2 and pancreatic insulinoma: We thank Dr. Christopher Newgard (Duke University, Durham, NC, USA) for the insulinoma cell line INS 832/13, Dr. Christopher Rhodes (University of Chicago, Chicago, IL, USA) for adenoviruses expressing GFP, prepro-rIAPP-GFP and prepro-hIAPP-GFP, Dr. Arnold W. Strauss (Vanderbilt University, Nashville, TN, USA) for rabbit anti-mMDH antibody.