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Inhibition of programmed cell death protein 1 (PD-1) restored macroscopic and histopathological damage caused by TNBS-induced colitis. Representative pictures showing the (a) colon length and (b, c) histopathological appearance of colonic tissue (scale bar = 200 μm). Data are expressed as the mean ± standard deviation (SD), ∗p < 0.05.
