Alexa Fluor 488 Cadaverine, 5-Isomer is a green fluorescent dye derived from cadaverine, featuring a primary amine that can specifically react with activated carboxyls, aldehydes, or ketones to form stable covalent conjugates. It exhibits excellent fluorescence brightness and photostability, and the single-isomer form ensures high uniformity of labeled products. This dye is widely applied in protein carboxyl labeling, cellular polarity tracing, and fixed-cell fluorescence studies, with excitation/emission around 493/516 nm.