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Effect of MPTP treatment in gastric and colon neuromuscular nitrite levels. Nitrite levels at 48 h were measured using the NO assay kit (ELISA). Values are mean ± SE (n = 4). Statistical significance was determined by Student’s t test. *p < 0.05 compared with wild-type animals. C Control, PD Parkinson’s disease, P.C proximal colon, M.C mid colon, D.C distal colon
