mFluor™ UV780 SE is a UV-excitable, amine-reactive fluorescent dye specifically engineered for multicolor flow cytometry applications. As part of the mFluor™ UV series, it features a large Stokes shift and is optimally excited by UV lasers at 350 nm. Its extended emission into the near-infrared region enables expanded panel design by occupying a rarely used spectral window. mFluor™ UV780 SE exhibits fluorescence excitation and emission maxima at ~350 nm and ~780 nm, respectively, making it one of the most red-shifted dyes excitable by UV light. The dye reacts efficiently with primary amines on proteins (>10 kDa), such as antibodies, providing a robust tool for custom conjugation. Its distinct spectral profile is highly compatible with spectral flow cytometers for complex immunophenotyping assays.