It is now well established that human type I diabetes is a chronic autoimmune process characterized by a rather “silent” prediabetic stage of several months to years in duration. (1) An important issue in diabetes research is the identification during the prediabetic period of subjects I at high risk of developing diabetes. Several immunologic and metabolic parameters have been studied to assess their reliability as predictors of 5 future development of diabetes in high risk individuals. Even if the combination of several of these factors proves to be highly specific in I defining the high risk individuals these studies require a lengthy follow-up period to ascertain their sensitivity and reliability in predicting impending diabetes.KeywordsMajor Histocompatibility ComplexBeta CellIslet AllograftAutoimmune Beta CellPrediabetic StageThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.