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Thanks to the high content of glutathione, Glutathione-rich yeast extract has certain physiological functions: Protect the enzyme activity The physiological function of glutathione-rich yeast extract is mainly because there is an active sulfhydryl on the side chain group of cysteine in glutathione, which can protect the sulfhydryl of protease in the body from being destroyed and achieving the function of protecting the enzyme activity

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Cys 2 ), cystine-free (Cys 2 -free), cystine-free/L-NAC-supplemented (400 M), cystine-free/D-NAC-supplemented (400 M) medium, untreated or treated with BSO (100 M) for 72 h, and relative cell numbers were determined (n = 4 technical replicates)