Cyanine7 NHS ester is widely used in biomedical research for labeling biomolecules such as proteins, peptides, and antibodies. Its near-infrared fluorescence makes it ideal for in vivo imaging, allowing researchers to track cellular processes and monitor disease progression in real time. It is particularly useful in cancer research for tumor detection and imaging due to its deep tissue penetration and minimal background interference. Additionally, it is employed in molecular diagnostics for developing sensitive assays and in drug delivery studies to visualize the distribution of therapeutic agents. Its stability and high reactivity with amino groups make it a versatile tool for conjugation in various experimental setups.