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A COA that reports and limits it shows a careful process
There has been ongoing debate regarding the precise identity of the AT4 receptor, with some evidence suggesting it is the insulin-regulated aminopeptidase (IRAP)
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Am J Physiol Endocrinol Metab 296, 256-261 (2009)
With a molecular weight of just 403.93 Da well below the 500 Da cutoff typically associated with significant skin penetration GHK-Cu is small enough to penetrate the stratum corneum (outer skin layer) in concentrations sufficient to activate regenerative processes
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