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Development of thiol-cleavable biotin-enabled proximity labeling. (A) General workflow for thiol-cleavable biotinylation and protein sample preparation. (B) Schematic of enzymatic reaction of SS-biotinylation, chemical cleavage of disulfide bonds to elute proteins off the streptavidin beads, and carbomethylation of the free thiol group to avoid reformation of disulfide bonds.
