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That fragment acts on a target the same Washington State group helped pin down: the so-called AT4 receptor, which was identified as IRAP, insulin-regulated aminopeptidase, an enzyme rather than a classical receptor (Albiston et al., J Biol Chem 2001)

Why Researchers Track This Decline The plasma decline matters to researchers because GHK-Cus concentration appears to track closely with markers of tissue repair capacity, making it a useful reference point for studying how cellular regeneration and extracellular matrix activity change with age

Injection sites can be local (near injury) or systemic (abdominal or thigh)

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