DSPE-PEG-Cy3, MW 3400, is a PEG lipid conjugated with a fluorescent group. The Cy3 fluorophore is frequently utilized in applications such as immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry. This dye exhibits a peak absorption wavelength in the range of 548-552 nm and a peak emission wavelength between 562-570 nm.