CY5-SE (Sulfo-Cyanine5 Succinimidyl Ester) is a reactive dye for the labeling of amino-groups in peptides, proteins, and oligonucleotides (Excitation: 649 nm, Emission: 670 nm).

Sulfo-Cyanine5 is an analog of Cy8, a very popular fluorophore, therefore this reagent is compatible to a wide range of standard fluorescent instrumentation such as imagers, plate readers, and microscopes.

CY5-SE triethylamine salt (Fluorolink Cy5 triethanolamine salt) is a hydrophilic amine-reactive fluorescent probe. It displays excitation/emission maxima of 646/662 nm, respectively. Cy5-SE-conjugated ligands have been used in the characterization of hematopoietic tumor microenvironments.

Cy5 diacid, SE is commonly used in biomolecular labeling, fluorescence imaging and other fluorescence biological analysis. Cy5 dyes and their derivatives are widely used to label polypeptides, proteins and nucleic acids.