Fluorescein-PEG12-Mal is a PEG linker containing a maleimide and a fluorescein dye. Maleimide is a thiol-specific covalent linker which is used to label cysteine residues in proteins while fluorescein is a fluorophore is a near-UV/Vis spectrum dye that can be used for in vivo fluorescence assays such as FRET.
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