CCK and irritable bowel syndrome: The correlation coefficient (r) and value of significance (P) for NEUROG3 cells with secretin were r = −0.89, P = 0.033 after FMT in the PI-IBS subgroup, and for NEUROG3 cells with serotonin were r = 0.89, P = 0.03 before FMT, and also with CCK were r = 0.89, P = 0.03 after FMT in the idiopathic IBS subgroup.