C peptide is a biomarker for beta cell function. In other words, it's a measure of beta cell health and insulin production, and is critical to developing new disease modifying therapies for type 1 Frontiers Ferroptosis: Mechanism and connections with cutaneous diseases Changes in ferrous iron and glutathione promote ferroptosis and frailty in aging Caenorhabditis elegans eLife Figure 5 from Glutathione S transferase and MRP1 form an integrated system involved in the storage and transport of dinitrosyl dithiolato iron complexes in cells. Semantic Scholar Ferroptosis as a therapeutic target in glioblastoma: Mechanisms and emerging strategies: Molecular Therapy Nucleic Acids