Fluorescein-5-maleimideCat # 130 Storage F/D/L (see storage codes below) Unit Size 25 mg Ex (nm) 493 Em (nm) 515 MW 427.36 Solvent DMSO Maleimides are among the most frequently used reagents for thiol modification. In most proteins, the site of reaction is at cysteine residues that either are intrinsically present or resulted from reduction of cystines. Unlike iodoacetamides, maleimides do not react with histidine and methionine under physiological conditions. Fluorescein-5-maleimide is one of the most popular fluorescent dyes for thiol modifications of proteins along with 5-TMRIA. Detailed Information: Protocol References MSDS Spectrum Related Products: Dye Labeling Reagents Fluoresceins Thiol-Reactive Probes Storage Codes: D = Desiccated L = Avoid light F = Freeze (<-15 癈) R = Refrigerated (2-4 癈) RT = Room temperature (4-50 癈)