Cy5-PEG-CH2COOH, MW 2,000 is a polyPEG reagent containing a cyanine dye with excitation/emmission maximum 649/667 nm and a free terminal carboxyl acid. Terminal carboxylic acid can react with primary amine groups in the presence of of activators (e.g. HATU) to form an amide bond. The hydophilic PEG polymer increases solubility in aqueous media.
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