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GHK-CU is a naturally occurring copper peptide, composed of the amino acids glycine, histidine, and lysine bound to a copper ion

This section will then further specify how the active TGF- isoform functions alone or with the cross-talk of other environmental cues, balances the self-renewal of stem cells, assists with differentiation during normal physiological development, and how TGF- acts as a pro-migratory factor to mobilize adult stem cells from their unique niche to repair damage and maintain normal tissue homeostasis

A hollow structure is formed excluding access of external solvent to the catalytic center (Mpakali et al., 2017)

Hepatology 57 , 555565 (2013)