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More recent research has highlighted an additional dimension: GHK-Cu's influence on gene expression

10.3390/life13071434 66 MasaadehA

Reactivity, in biological systems, is almost inevitably associated with toxicity, and ROS can damage various biological molecules: lipids (causing lipid peroxidation and membrane damage), DNA (causing DNA breaks), and proteins (causing, for instance, oxidation of various amino acids and inactivation of essential enzymes)