Cy3Dextran (MW 2000) is a fluorescent labeling reagent combining Cy3 dye with Dextran. The Cy3 fluorophore is typically utilized in applications such as immunolabeling, nucleic acid labeling, fluorescence microscopy, and flow cytometry. Dextran inhibits platelet aggregation and coagulation factors and is used as a plasma volume expander (Ex/Em = 550/570 nm).