SST and irritable bowel syndrome: The densities of somatostatin-immunoreactive cells were 365.6±55.9, 152.0±14.6, 131.5±18.3, 113.4±21.2 and 207.3±30.5 cells/mm2 in the control, IBS-total, IBS-D, IBS-M and IBS-C groups, respectively.