Cellular expressions of antioxidants in colon by day 14 after AIC induction. A-E. Showing immunohistochemical (IHC) microscopic finding (400 ×) for identification of positively-stained NAD(P)H quinone dehydrogenase (NQO) 1 cells (gray color). F. Analytical result of number of NQO1+ cells, * vs. other groups with different symbols (†, ‡, §, ¶), P<0.0001. G-K. Showing IHC microscopic finding (400 ×) for identification of positively-stained glutathione peroxidase (GPx) cells. L. Analytical result of number of GPx+ cells, * vs. other groups with different symbols (†, ‡, §, ¶), P<0.0001. Scale bars in right lower corner represent 20 µm. All statistical analyses were performed by one-way ANOVA, followed by Bonferroni multiple comparison post hoc test (n = 6 for each group). Symbols (*, †, ‡, §, ¶) indicate significance at the 0.05 level. SC = sham control; AIC = acute inflammatory colitis; Mel = melatonin; Exo = exosome.