DSPE-PEG-Rhodamine, MW 3400 is a PEG lipid conjugated with a fluorescent dye. This amphiphilic polymer can form lipid bilayers in water, useful for encapsulating therapeutic agents like liposomal anti-cancer drugs or mRNA vaccines. Rhodamine's peak absorption wavelength is 570 nm, with peak emission at 595 nm. Imaging techniques facilitate easy tracking of the Rhodamine red dye.