In a radiolabeled ligand assay to determine the binding affinity for an agonist, different concentrations of agonist are placed in test tubes with both a set number of receptors and radiolabeled ligand. Filters separate the bound and free radioligand, and a scintillation counter measures the number of bound radioligand. But how is the binding affinity of the agonist determined from all this?

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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In a radiolabeled ligand assay to determine the binding affinity for an agonist, different concentrations of agonist are placed in test tubes with both a set number of receptors and radiolabeled ligand. Filters separate the bound and free radioligand, and a scintillation counter measures the number of bound radioligand. But how is the binding affinity of the agonist determined from all this? 

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