DEAE-dex-Cy5 is a fluorescent labeling reagent that combines Cy5 fluorescent dye , Dextran (dex) and Diethylaminoethyl (DEAE). Cy5 is a Cyanine dye (with a long wavelength about 662nm) that can be used for molecular labeling and microscopy imaging. Dex has an inhibitory effect on thrombocyte aggregation and coagulation factors and is used as a plasma volume expander.