Developing functional musculoskeletal tissues through hypoxia and lysyl oxidase induced collagen cross linking PNAS Introduction GHK Cu is a copper peptide complex formed from the tripeptide glycyl L histidyl L lysine bound to copper. This compound has garnered significant attention in both laboratory and formulation research due to its critical role GHK Cu: Regenerative Signaling and Molecular Reprogramming Research English Version Peridico Digital Centroamericano y del Caribe Experimental and Therapeutic Medicine