Cyanine3 phosphoramidite, 5'-terminal is a fluorophore featuring a Cy3 dye ligated to a phosphoramidite group. This phosphoramidite is applied in solid-phase oligonucleotide synthesis to add a 5’-Cy3 dye to the target oligonucleotide. Cy3 is a cyanine dye with excitation and emission maxima at 555 nm and 570 nm respectively.
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