Anti-fluorescent dye antibodies recognize specific fluorophores and, in most cases, quench their fluorescence. Thus many anti-dye antibodies, including those that recognize fluorescein, can serve as cell-impermeant probes for determining whether fluorescent dye-conjugated ligands, proteins, bacteria or other biomolecules have been internalized by endocytic or pinocytic processes. The Alexa Fluor® 488 dye possesses near identical spectral properties and quantum yield to fluorescein isothiocyanate (FITC), but produces brighter, more photostable conjugates. These conjugates are used for imaging and other applications requiring increased sensitivity without being overly impacted by environmental factors.
AF488; Alexa 489; AlexaFluor488