Fluomicrospheres coated with antibodies or receptors eliminate the need to separate bound from free ligand in both radioimmunoassays and ligand-binding assays.
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Bosworth, N., Towers, P. Scintillation proximity assay. Nature 341, 167–168 (1989). https://doi.org/10.1038/341167a0
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DOI: https://doi.org/10.1038/341167a0
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