Histology examination of jejunal, ileal and colonic mucosa with H and E staining under optical microscopy (magnification*100). A-D: jejunal mucosa of C, S, E, EC group; E-H: ileal mucosa of C, S, E, EC group; I-L: colonic mucosa of C, S, E, EC group. Normal mucosa was viewed in C group. Mucosal structure distortion, villous collapse and edema, and epithelial shedding were observed in S and E groups. These damages were significantly attenuated in EC group.