We previously reported that transgenic overexpression of Nfkbid in NOD mice led to robust type 1 diabetes protection associated with enhanced negative selection of autoreactive T cells and expansion of regulatory T cells (Tregs) with increased suppressive capacity. The goal of this study was to further identify cellular and molecular mechanisms underlying strong protection from type 1 diabetes imbued by overexpressing Nfkbid. Transcript analysis of Tregs from Nfkbid-overexpressing NOD mice show