Sulfo-Cy3 diacid, SE is widely used in biomedical research for labeling biomolecules such as proteins, peptides, and nucleic acids. Its water solubility and reactive succinimidyl ester group make it ideal for conjugation with primary amines, enabling the study of molecular interactions and cellular processes through fluorescence imaging. It is particularly valuable in flow cytometry, confocal microscopy, and live-cell imaging due to its bright fluorescence and photostability. Additionally, it is employed in diagnostic assays and drug discovery to track and visualize target molecules with high sensitivity and specificity.