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33 Non-specific cysteine transporters While influx transporters are the main means by which cells acquire cystine, cysteine can also be taken up from the extracellular milieu into cells directly by excitatory amino acid transporter 3 (EAAT3) and the alanine-serine cysteine transporters 1 and 2 (ASCT1/2), all of which are known to be overexpressed in different cancer types 34 (Table 1)

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Stability data indicates Matrixyl degrades in highly acidic or alkaline formulations, so researchers should maintain pH 57 for optimal peptide integrity

Glycine serves muscle preservation

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