NOS1 and ulcerative colitis: In this context, the objective of this work was to study the GPR41 receptor in neurons of the myenteric plexus, specifically in immunoreactive neurons (-ir) to the enzyme neuronal nitric oxide synthase (nNOS), choline acetyltransferase (ChAT) and enteric glial cells glial fibrillary acid protein (GFAP)-ir, and analyze the effects of the use of Butyrate in mice submitted to experimental ulcerative colitis, with the purpose of evaluating whether Butyrate has a beneficial effect on ulcerative colitis and enteric neurons.