Biotium offers high quality amine-reactive succinimidyl ester (SE, or NHS-Ester) dyes used to label proteins, oligonucleotides, and nucleic acids. We offer Cyanine 555 (Cy®3), Cyanine 647 (Cy®5), Cyanine 770 (Cy®5.5), and Cyanine 750 (Cy®7) as high quality succinimidyl esters. Also see our CF® Dye...