Dextran-CY5.5 (MW 10000) is a CY5.5-labeled Dextran conjugate. CY5.5 is a cyanine dye with an excitation wavelength typically at 673 nm and an emission wavelength at 707 nm, and it is useful for labeling proteins, antibodies, and small molecule compounds. Dextran inhibits platelet aggregation and coagulation factors and can be used as a plasma volume expander.