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Adding a second peptide that targets a completely different receptor system produces compounding effects rather than diminishing returns

The bulkier proline occupies more of the S1 pocket than does alanine, which explains the higher affinity for peptides with proline versus alanine at the second position

In dermal fibroblasts cultured from aged donors, GHK-Cu treatment (2 M) increases TIMP-1 mRNA expression by approximately 25%, contributing to reduced net collagenolytic activity and preservation of existing matrix structures

Diabetic neuropathies

GPX4 alleviates diabetes mellitus-induced erectile dysfunction by inhibiting ferroptosis

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