Figure 3. CCK-8 assay of small intestinal epithelial cells after exosome and exo-PD treatment. (A) Cell viability of intestinal epithelial cells after IR at different exosome concentrations after 24 h treatment. (B) Cell viability of intestinal epithelial cells after IR at different exosome concentrations after 48 h treatment. (C) Cell viability of different groups after IR and treating with PD (10 μg/ml), exosome (exo, 100 μg/ml) and exo-PD (10 μg/ml) for 24 hours respectively. (D) Cell status observed microscopically after 72 h. Statistical plots with * as p < 0.05, ** as p < 0.01 and *** as p < 0.001 indicate that the differences between groups are statistically significant.