has part realizes is about has_specified_input has_specified_output role of has role immunoglobulin complex, circulating evaluant role fluorescence detection assay binding antibody binding detection by fluorescence quenching A binding assay in which affinity is measured by detecting a change in fluorescence (usually quenching) that occurs upon binding of the antibody to the ligand. The fluorescent signal that is affected by binding is either from an exogenous fluorophore attached to the ligand, or is the intrisic fluorescence of aromatic (tryptophan) residues on the binding site of the antibody (no conjugated fluorophore necessary) or, less commonly, on the ligand binding region (epitope). IEDB IEDB The binding affinity of Fab 4-4-20 for the fluorescein molecule was determined using the fluorescence quenching assay, by placing the Fab and the fluorescein together in a well and measuring the fluorescence after each addition of increasing concentrations of the Fab (PMID: 8637844). antibody binding detection by fluorescence quenching fluorescence quenching binding assay metadata complete