Cy5.5 cadaverine is widely used in biomedical research as a fluorescent labeling agent. Its near-infrared fluorescence makes it particularly valuable for in vivo imaging, allowing researchers to track biological processes in real-time with minimal background interference. It is commonly employed in the study of tumor targeting, angiogenesis, and cell trafficking, providing detailed visualization of molecular interactions and cellular pathways. Additionally, it is utilized in the development of diagnostic tools and therapeutic monitoring, enabling non-invasive assessment of disease progression and treatment efficacy. Its stability and sensitivity make it a preferred choice for advanced imaging techniques in preclinical studies.