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Sulfo-Cy3 NHS ester is a sulfonated, hydrophilic and highly water soluble dye. For labeling proteins and peptides, no organic co-solvent is needed. Sulfo-Cy3 NHS ester is ideal for proteins with low solubility and proteins prone to denaturation. Non-sulfonated Cy3 NHS ester is also available. 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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