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The copper ion is essential for biological activity the apo-peptide (GHK without copper) shows markedly reduced activity in most assay systems
Between 2003 and 2006, the citys economy grew in excess of 19.5% annually, the fastest in the country
It mimics your bodys natural Growth Hormone Releasing Hormone (GHRH) and binds to GHRH receptors in the hypothalamus
Nature 488, 499503
