Cy3-PEG-biotin (MW 5000) is a polyethylene glycol derivative containing Cy3 fluorescent dye and polyethylene glycol (PEG) and a Biotin. Biotin can bind with high affinity to streptavidin or avidin. Cy3-PEG-biotin (MW 5000) plays an important role in the specific capture and detection of biomolecules.