HiLyte Fluor™ 405 is a blue fluorescent dye with Ex/Em = 404/428 nm, spectrally similar to Alexa Fluor™ 405 and DyLight Fluor™ 405 dyes. Conjugates of HiLyte Fluor™ 405 are well excited by the 407 nm spectral line of the Krypton laser and the 408 nm line of the violet laser diode. HiLyte Fluor™ 405 acid, SE is an amine reactive reagent for labeling peptides, proteins and antibodies.