L Cystine N Acetyl Cysteine (Glutathione Precursor) Sulfur metabolism under stress: Oxidized glutathione inhibits methionine biosynthesis by destabilizing the enzyme cystathionine < em> synthase Catabolism of extracellular glutathione supplies cysteine to support tumours Nature Frontiers The versatile utility of cysteine as a target for cancer treatment
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