Cy5-PEG-CH2COO-NHS, MW 2,000 contains Cy5, which is a bright red fluorescent dye with excitation and emission maxima at 651 nm and 670 nm respectively, and a free NHS ester that can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The PEG polymer increases the hydrophilicity of the conjugated molecule.
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