Abstract
In the receptor-immunoassay, the binding of anti-HCG[human chorionic gonadotropin]-.beta. sera to 125I-HCG and 125I-HLH [human luteinizing hormone] is measured in the presence of bovine corpus luteum ''receptor''. Anti-sera specific for HCG show little binding with 125I-HLH. The receptor-immunoassay permits an evaluation of specificity, affinity and the ability of anti-HCG-.beta. sera to compete with the ''receptor'' for binding to 125I-HCG.

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