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Title: Milk progesterone radioimmunoassay using radioiodinated tracers: a rapid and reliable assay system. Author: Espinosa J, Botana LM, Puentes E, Regueiro BJ. Journal: Steroids; 1984 Sep; 44(3):217-28. PubMed ID: 6537052. Abstract: Both the validity and practicability of a direct progesterone radioimmunoassay based on radioiodinated progesterone tracers were studied. The results obtained show the reliability of the assay; when compared with assays based on 3H-progesterone tracers there are fewer steps for assay execution, saving time and reducing the number of reagents used. Various commercially available 125I-progesterone tracers were assayed, and only those with an 11 alpha-hemisuccinate bridge were suitably bound by antisera raised against progesterone-bovine serum albumin conjugates having identical bridge structure. The bridge effect caused no observable alteration in validity parameters. Finally, our results support the utility of this assay as a practical method of early diagnosis of pregnancy and as a reliable experimental technique to monitor cow ovarian function.[Abstract] [Full Text] [Related] [New Search]