UBQ-3 NHS Ester is a fluorescent agent with a terminal NHS ester group. UBQ-3 NHS Ester has a wide quenching range from 620-730 nm, which makes the compound useful as an acceptor in fluorescence resonance energy transfer (FRET) applications in conjunction with far-red to near-IR emitting dyes such as Cy5, Cy5.5, BP Fluor 647. The NHS ester can be applied to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.