Used as a fluorescent labeling agent in biological imaging and detection assays. Its high fluorescence intensity and photostability make it suitable for tracking biomolecules such as proteins and nucleic acids in live and fixed cells. Commonly conjugated to antibodies or streptavidin for use in fluorescence microscopy, flow cytometry, and immunoassays. Exhibits good solubility in aqueous buffers and minimal interference with biomolecule function, allowing for sensitive and specific detection in complex biological samples.