| radioreceptor | 1. A receptor that normally responds to radiant energy such as light or heat. 2. A receptor used as a binding agent for unlabelled and radiolabelled analyte in a type of competitive binding assay called radioreceptor assay. (05 Mar 2000) |
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| radioreceptor assay | A competitive binding assay in which the binder is a membrane or tissue receptor rather than an antibody. (05 Mar 2000) |