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7 In fact, xCT is considered to be the main transporter of cystine in cancer (Table 1) 25,26,27 and its expression is controlled by nuclear factor erythroid 2-related factor 2 (NRF2), a master regulator of the cellular redox state, 28 highlighting the importance of xCT in an oxidative stress-resistant cancer cell phenotype
*J Appl Physiol.* 110(3):774-780
This stability window is comparable to [BPC-157]( and [Thymosin Beta-4]( but shorter than highly stable peptides like [Epithalon]( which can maintain potency for 60+ days post-reconstitution
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& Liu, X
Copper binding is primarily mediated by the histidine and glycine residues, forming a stable coordination complex
