This protein labeling kit comprises our superior near-IR fluorescent dye CF™680 in succinimidyl ester form and other necessary materials for labeling 3×1 mg antibody. CF™680 is brighter than other spectrally similar dyes. Most importantly, antibody conjugates prepared from CF™680 have by far the best signal-to-noise ratio than antibody conjugates prepared from other spectrally similar dyes. Please also check out our CF™680R, an extremely photostable rhodamine-based near-IR dye. Please download the CF™680 dye flyer for more details. For labeling antibodies for in vivo imaging, please see our VivoBrite rapid antibody labeling kit, CF™680 SE (92160).