CF™680 succinimidyl ester (CF™680 SE) is an amine-reactive, near IR fluorescent dye. When conjugated to protein, the dye has an absorption peak at 681 nm and emission peak at 698 nm. CF™680 is significantly brighter and more stable than similar near-IR dyes, such as Alexa Fluor® 680 and Cy®5.5. Like our other near-IR CF™ dyes, CF™680 is ideal for in vivo imaging. CF™680-labeled antibodies can be used for near-IR Western blotting and flow cytometry. Biotium also offers CF™680 VivoBrite labeling kit for small animal in vivo imaging (cat# 92160).