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Cys(Npys)-TAT (47-57), corresponding to the protein transduction domain of TAT protein, is synthesized from the activated cysteine residue C(Npys), where Npys is 3-Nitro-2-pyridinesulfenyl group that activates cysteine S and reacts rapidly when thiol groups are introduced. This modification has been used to make the peptide suitable for conjugation studies as a cell-penetrating and carrier peptide.