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These transgenic mice showed significantly reduced plasma testosterone levels (18% of normal)[124] and the IGF-I deficiency was correlated with an ultrastructural analysis of mutant Leydig cells revealing a significant developmental delay, with fewer and smaller Leydig cells than normal

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First isolated from human plasma, it represents one of the most biologically active copper complexes studied in regenerative science

The human peptide GHK stimulates blood vessel and nerve outgrowth, increases collagen, elastin, and glycosaminoglycan synthesis, and supports fibroblast activity in aged skin. Pickart & Margolina, International Journal of Molecular Sciences 2

Conflicts of Interest The author declares no conflict of interest

The binding was exclusive to IGFs and did not apply to insulin or proinsulin despite their structural similarities