Chromeo 494 is a red fluorescent label that is excitable at a wavelength of 488 nm by Argon Laser, LED, Xenon-Arc or Tungsten-Halogen lamps. It has a very large Stokes shift of 134 nm. The dye is available as NHS-ester, azide, alkyne, biotin-, Streptavidin- or secondary antibody conjugate.