Cy7 ethylenediamine is widely used in biomedical research as a fluorescent dye for imaging and diagnostics. Its near-infrared fluorescence makes it ideal for in vivo imaging, as it penetrates tissues deeply with minimal background interference. It is commonly employed in labeling proteins, peptides, and antibodies for tracking biological processes in real time. Additionally, it is utilized in the development of targeted drug delivery systems, where it helps monitor the distribution and efficacy of therapeutic agents. Its stability and high sensitivity also make it valuable in molecular probe design for detecting specific biomolecules in complex biological systems.