VIP and ring chromosome 6: In addition to mHTT‐immunoreactive inclusions (aggregates), decreased expression of the enteric neuropeptides such as vasoactive intestinal polypeptide (VIP), cocaine‐ and amphetamine‐regulated transcript (CART), protein gene product (PGP) and vesicular acetylcholine transporter (VaCHT) have been reported in R6/2 HD mice [13].