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only the first amino acid differs ( glycine in GHK-Cu vs alanine in AHK-Cu)

We conclude that inclusion of glutathione in the regolith simulant is sufficient to effectively preserve telomeres at the same length as in plants grown in Earth soil

Londero D, Greco PL

The resulting oxidized form of GSH either reacts with another GSH molecule to form GSSG or with cysteine groups on cellular proteins to form protein GSH mixed disulfides, a process known as protein glutathionylation. This latter reaction can change the proteins structure and function, which can, in turn, evoke a functional change within the cell

Ribas, V., Garca-Ruiz, C., Fernndez-Checa, J.C