Cy3-PEG-NH2 (MW 10000) is a polyethylene glycol derivative that features a Cy3 fluorescent dye, polyethylene glycol (PEG), and an amino group. The Cy3 fluorophore is commonly utilized in applications such as immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry. Its peak emission wavelength ranges from approximately 562 to 570 nm. Cy3-PEG-NH2 (MW 10000) can be employed for fluorescence imaging, fluorescent tracing, and fluorescent labeling.