Sulfo-Cy3 cadaverine is widely used in biological research for labeling proteins, peptides, and other biomolecules. Its fluorescent properties make it an excellent tool for imaging and tracking cellular processes in live or fixed cells. The compound is particularly useful in fluorescence microscopy, flow cytometry, and other techniques that require high sensitivity and photostability. It is also employed in studying protein interactions, localization, and dynamics within cells. Additionally, its water solubility enhances its applicability in aqueous environments, making it suitable for in vivo studies. Researchers often use it to label antibodies, nucleic acids, or other probes for targeted imaging and diagnostics.