M Urciuoli

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In guinea pig isolated ileum longitudinal muscle myenteric plexus, cholecystokinin octapeptide (CCK-8S) produced a rapid (phasic) contraction followed by a slower tonic phase. The tetrapeptide derivative CCK-4 and pentagastrin elicited only the phasic response up to 10(-6) M, whereas the tonic phase was also apparent at higher concentrations. The rank order(More)
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