Vari Fluor 640 SE (VF 640 SE) is a dye marker of the Vari Fluor SE series (Ex/Em=648 nm/664 nm) . The Vari Fluor SE series of dyes are a class of fluorescent dyes containing NHS ester groups used to label free amines (-NHX) on antibodies, proteins, peptides, amine-modified oligonucleotides and other biomolecules.
