Cy3 ethylenediamine is widely used in fluorescence labeling and imaging applications, particularly in biological and biomedical research. Its ability to conjugate with proteins, nucleic acids, and other biomolecules makes it a valuable tool for studying cellular processes, molecular interactions, and tissue structures. The compound is often employed in fluorescence microscopy, flow cytometry, and in vivo imaging due to its bright and stable fluorescence properties. It is also utilized in diagnostic assays and as a probe for tracking and visualizing specific targets in complex biological systems. Additionally, Cy3 ethylenediamine is applied in drug delivery research to monitor the distribution and uptake of therapeutic agents in cells and tissues.