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10.1016/j.tcb.2005.08.009 [DOI] [PubMed] [Google Scholar] Mohammed F

GHK exists naturally in saliva and urine as well, released from extracellular matrix proteins including SPARC and the collagen 2(I) chain during tissue injury, functioning as a matrikine damage signal that activates repair mechanisms

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Clin Otolaryngol Allied Sci

Both are used in a strict research context only
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