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"Gastric pentadecapeptide body protection compound BPC 157 and its role in accelerating musculoskeletal soft tissue healing." Cell Tissue Res

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)

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

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