Alexa Fluor 647 Cadaverine is a bright far-red fluorescent dye with good water solubility and polar properties, suitable as a fluorescent polarity tracer. Its excitation/emission maxima are approximately 651/672 nm, compatible with 633 nm laser excitation. The primary amine functional group allows covalent conjugation to proteins or other biomolecules via carboxyl activation. This dye is widely applied in live-cell imaging, molecular tracking, and multicolor fluorescence analysis.