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Introduction Cysteine, a sulfhydryl-containing proteinogenic amino acid essential for the human body, is employed in a variety of metabolic pathways, such as the regulation of reduced glutathione (GSH), a major endogenous antioxidant molecule and the generation of sulfur-containing biomolecules such as hydrogen sulfide (H 2 S), taurine, coenzyme A and biotin ( Figure 1 ) ( Figure 1 Cysteine metabolism in cancer and tumor microenvironment It is increasingly noted that altered levels of amino acids including cysteine in the tumor microenvironment, by uptake or processing of both intracellular and extracellular regions, have emerged as potential markers of tumor progression
GluN2A-NMDA receptor-mediated sustained Ca2+ influx leads to homocysteine-induced neuronal cell death
Researchers continue to study how its biological activity influences epithelial tissues, tendons, ligaments, and other connective tissues while expanding scientific understanding of the cellular mechanisms that regulate tissue integrity and adaptation