Effects of Aloe vera on serum tumor necrosis factor-alpha, serum cytokine-induced neutrophil chemoattractant-1, gastric malondialdehyde, interleukin-18 gastric epithelial positive stained cells in rats with indomethacin-induced gastric ulcer. A: Tumor necrosis factor-alpha (TNF-α), aP < 0.05 vs indomethacin (IMN) group, bP < 0.01 vs control group; B: Cytokine-induced neutrophil chemoattractant-1 (CINC-1), cP < 0.05 vs IMN group, dP < 0.01 vs control group; C: Gastric malondialdehyde (MDA), fP < 0.01 vs IMN group, hP < 0.01 vs control group; D: Interleukin (IL)-18, jP < 0.01 vs IMN group, lP < 0.01 vs control group. 1: Control; 2: IMN; 3: Aloe vera-treated.