DAz-2 is a sulfonic acid probe for living cells, which can directly detect sulfonic acid-modified proteins in living cells and is cell-permeable[1].
References
[1] Leonard SE, et al. Mining the thiol proteome for sulfenic acid modifications reveals new targets for oxidation in cells. ACS Chem Biol. 2009 Sep 18;4(9):783-99. DOI:10.1021/cb900105q
