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No dedicated membrane receptor or intracellular binding protein for GHK-Cu has been definitively identified and pharmacologically characterized, which is why the copper-shuttle model, rather than a receptor-occupancy model, dominates mechanistic discussion

10.1016/j.ajme.2017.09.001 10.1016/j.ajme.2017.09.001 [DOI] [Google Scholar] Islinger M, Voelkl A, Fahimi HD, Schrader M (2018) The peroxisome: an update on mysteries 2.0

Webb JEA
Mixing up these measurements can lead to ten-fold dosing errors
