Initial Glutathione Depletion During Short Term Bed Rest: Pinpointing Synthesis and Degradation Checkpoints in the Glutamyl Cycle Differentiating Changes in Glutathione Levels from Cytotoxic Events Using Multiplexed Assays 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