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Synergy of GHKCu and hyaluronic acid on collagen IV upregulation via fibroblast and exvivo skin tests Jiang 2023 Journal of Cosmetic Dermatology Wiley Online Library Negative feedback Wikipedia Copper peptide (GHK Cu) SIELC Technologies File:1805 Negative Feedback Loop.jpg Wikipedia
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ghk-cu negative feedback loops Feedback Loops
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