Apoptosis and glutathione: beyond an antioxidant Cell Death & Differentiation Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho phthalaldehyde in Cultured Mammalian Cells In Vitro Glutathione depletion induces ferroptosis, autophagy, and premature cell senescence in retinal pigment epithelial cells Cell Death & Disease Glutathione Depletion Is Necessary for Apoptosis in Lymphoid Cells Independent of Reactive Oxygen Species Formation* Journal of Biological Chemistry