CD80 and diabetes mellitus: We showed that ppins antigens excluded from expression in the endoplasmic reticulum (ER) did not induce CD8+ T cells or autoimmune diabetes in RIP-B7.1 tg mice, but efficiently suppressed spontaneous diabetes development in NOD mice as well as ppins-induced CD8+ T cell-mediated autoimmune diabetes in PD-L1−/− mice.