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Affinity for Copper and Copper Ion Signaling Copper is biologically active and participates in enzymes involved in connective tissue and antioxidant systems, while GHK-Cu is studied as a way copper may be delivered or coordinated in tissue contexts [1], [10]
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Interestingly, the characteristic absorbance peak of HSYA at 402 nm completely disappeared, but the broad characteristic ligand-to-metal charge transfer band of catechol moieties interacting with iron ions located at 555 nm appeared (Fig
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