Fig. 8.
The expression of substance P (SP) in the colon as evaluated by immunohistochemistry (×200). (A) Control subjects; (B) irritable bowel syndrome-diarrhea (IBS-D) patients; (C) irritable bowel syndrome-constipation (IBS-C) patients. (D) An increase in SP was found in IBS-D patients compared to control subjects, and there was a significant difference between the IBS-D and IBS-C groups. *p<0.05 compared with control subjects; †p<0.05 compared with IBS-C subjects.