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In the GHK-Cu complex, the copper ion coordinates with multiple binding sites: the nitrogen from the histidine imidazole side chain, the alpha-amino group of glycine, the deprotonated amide nitrogen of the glycine-histidine peptide bond, and oxygen from the lysine carboxyl group, forming a square-planar pyramid configuration

BPC-157 is not an FDA-approved drug, which means it is not available as a retail prescription the way a branded pharmaceutical is

Molecular insights into differentiated ligand recognition of the human parathyroid hormone receptor 2

We maintained the tubes in ice for 10 min and determined the absorbance at the wavelengths of 532 and 570 nm