Cy3B maleimide

Cy3B maleimide is a mono-reactive dye containing maleimide group, which can selectively and efficiently attach Cyanine3 fluorophore (an analog of Cy3) to proteins and peptides containing cysteine residues, as well as to other thiolated molecules (such as thiol-containing oligonucleotides) . Cy3B is an improved version of Cy3 dyes with significantly increased fluorescence quantum yield and photostability.