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These peptides are complex molecules, not simple chemical compounds

J., Tseng, Y

Copper Peptides Explained: The HoMEso GHK-Cu Kit Copper peptides are skin-supporting peptides bound to copper, best known for helping the look of firmness, smoothness and visible skin resilience

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The second step in BH 4 synthesis, catalyzed by 6-pyruvoyltetrahydropterin synthase (PTPS), involves the Zn 2+ and Mg 2+ -dependent rearrangement of 7,8-dihydroneopterin triphosphate, with concommitant loss of the triphosphate, to 6-pyruvoyltetrahydropterin