800CW NHS ester is an amine reactive near-infrared high water-soluble fluorescent dye, it can be labeled to biomolecules directly, such as primary antibody, secondary antibody, peptide, etc. The conjugates can be used as a probe for Western blot, flow cytometry, immunocytochemical assays, including In-Cell Western鈩?assays and On-Cell Western cell-based assays, protein arrays, microscopy, tissue section imaging, in vivo imaging and optical probe development. 800CW dye-conjugated agents and probes are currently propelling more than a dozen Phase I or Phase II clinical trials, more than any other near-infrared fluorescent dye on the market.