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W.LewisD
Two different reference preparations have been widely employed for hCG assay standardization: the Third International Standard, formerly known as the First International Reference Preparation (IRP) of hCG for Immunoassay (1974), and the Second International Standard of hCG for Bioassay (1964).82, 83 These materials are not equivalent, having been characterized for immunoassays and bioassays, respectively
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