Sulfo-Cy5.5 Azide is a water-soluble dye containing an azide group, which enables Click Chemistry. Absorbance and emission of the dye are identical to Cy5.5 fluorophore. The reagent is designed for the labeling of sensitive molecules such as proteins, and even intact biological objects in the water phase. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.