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To assess the role of ORL1 (opioid receptor-like 1) receptor in the bowel movement, we investigated the effect of nociceptin on colonic contraction and transit in rats. Nociceptin (0.1-100 nM) concentration-dependently caused an immediate tonic contraction followed by rhythmic waves of contractions in the isolated colon. The response to nociceptin (10 nM)(More)
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