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Res Commun Chem Pathol Pharmacol. 1981 Dec;34(3):543-6.

Morphiceptin ( beta-casomorphin (1-4) amide): a peptide opioid antagonist in the field stimulated rat vas deferens.


The effect of Morphiceptin (H-Tyr-Pro-Phe-Pro-NH2) on opioid inhibition of field stimulated rat vas deferens (RVD) was studied. The morphiceptin was found to produce a weak inhibition of the twitch response of the RVD. In addition morphiceptin antagonized full agonists acting on the same receptor system (i.e. beta-endorphin selective antagonist for the delta receptor system of RVD by virtue of being a weak partial agonist.

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