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It carries copper into cells where copper-dependent enzymes need it, and the GHK fragment itself acts as a signaling peptide that influences gene expression in fibroblasts and other tissue cells

Another explanation could be that these adducts may break into lactone and the substrates (for example, secondary amines) of former Micheal-type addition reaction, due to the reversibility of this type of reaction (Lawrence et al., 2001)

Although evidence has shown the presence of XO in the human brain, which catalyzes purine metabolism to UA, the concentration of UA generated in situ in the brain is low