Cy5 Protein Labeling Kit is an innovative technology that enables direct labeling of proteins, peptides or other biomolecules. Cyanine dyes(Cy5) are commonly used as fluorescent labels for proteins, nucleic acids and small molecules.It has excitation and emission spectrum peak wavelengths of approximately 643nm/ 667nm nm. The Cy5-Protein conjugates are suitable for immunofluorescent staining, in situ hybridization, flow cytometry and other biological applications.