Bis-sulfone-PEG3-Biotin is a short linker consisting of a Bis-sulfone group and a biotin group. The sulfone group is a covalent ligand which is reactive with thiols and this can be employed to label cysteine residues in proteins. Meanwhile, biotin is an affinity ligand and it is used in biochemical applications such as pull-down assays or for ligating with streptavidin proteins.
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