SLC6A4 and irritable bowel syndrome: The immunoreactivity intensities for SERT were 132.7±1.4, 132.0±0.7, 134.5±0.8, 131.1±1.2 and 130.5±1.4 in the control, IBS-total, IBS-D, IBS-M and IBS-C groups, respectively, with no significant differences between any of these groups (P=0.142; Figs. 7 and 8).