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In order to minimize proteolysis, all steps of the protein purification should be carried out at 4 C, unless otherwise noted
10.3390/biom12010020 414
Accredit Qual Assur 12:A512
But that manufacturing process is energy dependent, nutrient dependent, and sensitive to stress
Many commercial "copper peptide" products actually contain Pal-GHK rather than GHK-Cu, but the two compounds have different physicochemical properties and may not behave identically in skin
