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The two molecules differ by more than 5x in mass: the 7-mer at ~889 Da versus full T4 at ~4921 Da
This is consistent with GHK-Cus known role in upregulating collagen synthesis in dermal fibroblasts, a mechanism confirmed in a comprehensive review in Biomolecules documenting GHK-Cus influence across more than 4,000 human genes involved in tissue remodeling and repair
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