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Eubacterium rectale improves the efficacy of anti-PD1 immunotherapy in melanoma via l-serine-mediated NK cell activation

That differs cysteine from another sulfur amino acid - methionine which has a methyl group attached to the sulfur

Tumor necrosis factor-: a potentially neurodestructive cytokine produced by glia in the human glaucomatous optic nerve head

In addition, it can both inhibit cystine uptake into cells via system x thereby promoting oxidative stress and, as it is a substrate inhibitor, promote L-glu release from cells via the same transporter, which can enhance excitotoxicity through activation of mGluR5 (Liu et al., 2009)