This protein labeling kit comprises the far-red fluorescent dye CF™660C in succinimidyl ester (SE) form and other necessary materials for labeling 3×1 mg antibody. CF™660C is a cyanine-based dye engineered to be highly water-soluble without being excessively charged. As a result, CF™660C-antibody conjugates have high signal-to-noise ratio in immunostaining. CF™660C is several fold brighter and significantly more photostable than Alexa Fluor® 660. CF™660C absorbs at 667 nm but can still be sufficiently excited by the 633 or 635 nm laser with emission at 685 nm in the borderline spectral region between far-red and near-IR fluorescence. Please also see CF™660R, an exceptionally photostable 660 nm dye ideal for confocal microscopy. For more information, please download the dye flyer.Compatible with the NucleoCounter® NC-3000™.