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Cystine rather than cysteine is the preferred substrate for elimination by cystathionine lyase: implications for dietary methionine restriction GeroScience Springer Nature Link Catabolism of extracellular glutathione supplies cysteine to support tumours Nature The basics of thiols and cysteines in redox biology and chemistry ScienceDirect Glutathione Homeostasis and Functions: Potential Targets for Medical Interventions PMC DFTGuided Discovery of EthynylTriazolylPhosphinates as Modular Electrophiles for Chemoselective Cysteine Bioconjugation and Profiling Stieger 2022 Angewandte Chemie International Edition Wiley Online Library A simple RP HPLC method for the stability indicating determination of N< em> acetyl L cysteine and N,N'< em> diacetyl L cystine in cell culture media