?:definition
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Immunoassay reagents intended to perform qualitative and/or quantitative analyses in tissue preparations to determine molecular structures (i.e., receptors) within or on the surface of the cells (typically some specific proteins) that permit selective binding with high affinity and great specificity to particular substances (e.g., hormones, such as estrogen and progesterone). These reagents are mostly used in monoclonal antibodies-based assays that act on direct antigenic recognition.
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