Dextran-CY5.5 (MW 40000) is a Dextran conjugate labeled with CY5.5, a cyanine dye with typical excitation and emission wavelengths of 673 nm and 707 nm, respectively. This dye is used for labeling proteins, antibodies, and small molecules. Dextran inhibits platelet aggregation and coagulation factors and can serve as a plasma volume expander.