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Effect of the hexapeptide Ac-RYYRIK-NH2 on the stimulation of binding of [35S]-GTPγS to rat cortex membranes by noc/OFQ and agonists for the μ-(DAMGO), δ-(DPDPE), and κ-opioid (U-504,88) receptor. Data are expressed as differences between binding in presence and absence of the compounds tested and are representative of three separate experiments.
