Inhibitory effect of PEA (10 mg·kg−1, i.p.) on upper gastrointestinal transit in OM-treated mice or in the presence of the TRPV1 channel antagonist 5′-iodoresiniferatoxin (I-RTX, 0.17 mg·kg−1, i.p.). Transit was measured 28 days after OM or vehicle (30% ethanol) administration. Results (the means ± SEM of six to eight mice for each experimental group) are expressed as a percentage of upper gastrointestinal transit. #P < 0.05, significantly different from vehicle, **P < 0.01, ***P < 0.001 significantly different from OM; ††P < 0.01, significantly different from PEA.