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  • Title: [125I][D-Tyr25,Nle28,31]CCK-(25-33): a convenient new aminopeptidase resistant cholecystokinin analogue for radioligand binding and autoradiography.
    Author: Carlberg M, Beart PM, Jarrott B.
    Journal: Eur J Pharmacol; 1990 Nov 20; 191(1):107-10. PubMed ID: 2092997.
    Abstract:
    The 125I-labeled sulfated cholecystokinin (CCK) analogue, [D-Tyr25,Nle28,31]CCK-(25-33), bound saturably to membranes from rat cerebral cortex and to brain tissue sections. Competition studies suggested binding to sites of the CCKB subtypes. The high affinity for brain membranes (Kd = 0.14 nM) and high specific binding to brain sections (80-90% specific binding), as well as its high specific radioactivity, makes it a suitable ligand for autoradiographic studies of cholecystokinin receptors.
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