HTRF® labeling reagents are a do-it-yourself solution for labeling biomolecules with donor and acceptors fluorophores as well as chemical tags. The availability of various functional groups on Eu3+ Cryptate and XL665 adds significant flexibility to labeling strategies and assay design. In addition, our Cryptate Labeling Kit contains all the necessary components for small-scale cryptate labeling and is suitable for labeling peptides, proteins, oligos and other small molecules. If a do-it-yourself solution isn't for you, Cisbio Bioassays's team of labeling experts is available through our custom labeling service.