AAT Bioquest's mFluor™ dyes are developed for flow cytometry-focused applications. These dyes have large Stokes Shifts, and can be well excited by the laser lines of flow cytometers (e.g., 405 nm, 488 nm and 633 nm). mFluor™ Red 780 dyes have fluorescence excitation and emission maxima of ~629 nm and ~780 nm respectively. Like Alexa Fluor 750-APC tandem, it has strong absorption at 633 nm, making its conjugates readily excitable by 633 nm red laser. These spectral characteristics make mFluor™ Red 780 an excellent alternative to Alexa Fluor 700-APC tandem. mFluor™ Red 780 is a small organic molecule that is much easier to use than the Alexa Fluor 750-APC tandem. mFluor™ Red 780 SE is reasonably stable and shows good reactivity and selectivity with protein amino groups. This kit has all the essential components to perform two separate labeling reactions with no column purification needed. Each of the two vials of mFluor™ Red 780 provided in the kit is optimized for labeling ~50 µg antibody. mFluor™ Red 780 antibody labeling kit provides a convenient method to label small amounts of monoclonal, polyclonal antibodies or other proteins (>10 kDa) with the mFluor™ Red 780 dye.