Sulfo-Cy3 ethylenediamine is widely used in the field of biological imaging and diagnostics due to its strong fluorescence properties. It is commonly employed as a labeling agent for biomolecules such as proteins, antibodies, and nucleic acids, enabling researchers to track and visualize these molecules in complex biological systems. Its water solubility, facilitated by the sulfonate group, makes it particularly suitable for applications in aqueous environments, such as live-cell imaging and flow cytometry. Additionally, it is utilized in fluorescence microscopy to study cellular processes and interactions with high specificity and sensitivity. The compound is also applied in drug discovery and development for screening and identifying potential therapeutic targets. Its stability and bright emission in the visible range make it a valuable tool in various biomedical research applications.