Used in bioconjugation and labeling applications to track biomolecules in cellular and molecular studies. The FITC fluorophore allows detection via fluorescence microscopy or flow cytometry, while the NH2-PEG arm provides water solubility and spacing between the fluorophore and the target molecule. Commonly used to label proteins, peptides, and nanoparticles for imaging and diagnostics. The PEG linker reduces non-specific binding and improves stability in biological environments. Ideal for studying cell surface receptors, protein interactions, and drug delivery systems.