GAPDH and lung carcinoma: The authors combined this method with 2D gel electrophoresis toanalyse persulfides in CSE overexpressing lung carcinoma A549 cells and foundapproximately 24 different proteins to form persulfides among them protein disulfideisomerase, heat shock proteins, aldo-keto reductase, GAPDH, enolase, andphosphoglycerate kinase.