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Sulfo-Cy3 azide is a sulfonated, hydrophilic and highly water soluble dye for Click Chemistry. For labeling of various molecules in aqueous phase for brightness and photostability of fluorophore, sulfo-Cy3 azide is an ideal choice. Click reaction can be carried out in pure water without need to use organic co-solvent. For labeling proteins and even intact biological objects, no organic co-solvent is needed. In life science, the sulfonate groups make the Cy dyes soluble in water and also reduce fluorescence-quenching which can arise from dye–dye interactions.
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