Uterine mustard oil (MO) instillation provokes colonic motility in a dose-dependent manner. (A) In contrast to corn oil (CO; 0.2 ml), which did not affect colonic motility, intrauterine dispensing of MO (0.2 ml) at concentrations of 0.05, 0.1, and 0.5% provoked rhythmic colonic contractions in the intracolonic pressure (ICP) tracings. The arrow at the bottom indicates the timepoint for corn/MO instillation. (B) Summarized data showing that uterine MO, but not CO, injections increased the contraction count in the ICP curve in a dose-dependent manner compared with the preinjection controls (**P < 0.01, vs. control, n = 7).