Cyanine NS succinimidyl esters are non-sulfonated cyanine dyes that can be used to label proteins, oligonucleotides and nucleic acids. Available in 3 colors, Cyanine 488NS, Cyanine 555NS,  and Cyanine 647NS are non-sulfonated versions of Cy®2, Cy®3, and Cy®5, respectively. They are designed to match by charge and molecular weight for 2D DIGE platform. Biotium offers these dyes as high quality amine-reactive succinimidyl esters.  Cyanine 555NS   Ex/Em 547/572 nm  MW: 682  MW added to protein: 441  Red solid soluble in DMF or DMSO  Store desiccated at -20°C; protect from light   Also see sulfonated Cyanine Dye Succinimidyl Esters and Biotium's CF® Dye Succinimidyl Esters, available with more than 20 bright and photostable CF® Dyes.  Cy dye is a registered trademark of GE Healthcare.