RGS2 and Huntington disease: In addition, numerous miRNAs linked to HD have been found to be embodied in exosomes: (i) miR-214, miR-150, miR-146a and miR-125b, which are reported to be able to target both human and mouse HTT in a cell model of HD, (ii) miR-22 that regulates several HD-related proteins such as histone deacetylase 4 (HDAC4), REST corepressor 1 (Rcor1) and regulator of G-protein signaling 2 (Rgs2), (iii) miRNA-128a that interacts with HTT and is downregulated in HD mouse and HD patient brain tissues.