IL10 and Autoimmunity: Maintenance of self-tolerance and prevention of the development of autoimmunity by Tregs is accomplished by mechanisms such as the killing of Tregs target cells, the modification of target cell signaling, the secretion of anti-inflammatory cytokines such as interleukin-10 (IL-10), IL-35, and transforming growth factor β (TGF-β), and the regulation of target cells by exosome-borne microRNAs [22,23,24,25].