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5-Aminofluorescein (5-AF) (5-AF) is a covalently-bound fluorescence marker conjugated with human serum albumin. It exhibits an excitation wavelength of 490 nm and an emission wavelength of 515 nm.

5-Aminofluorescein hydrochloride (5-AF hydrochloride) is a protein fluorescence labeling reagent known for its outstanding fluorescent properties and is extensively utilized in biomedical research for cell imaging and molecular probes. This compound enables the observation of protein localization and dynamic changes, providing insightful biological understanding. Additionally, 5-Aminofluorescein hydrochloride is employed to detect interactions between biomolecules, aiding in the elucidation of complex biological processes.