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Access this article Similar content being viewed by others Abbreviations AAS: Atomic absorption spectroscopy DMEM: Dulbeccos modified Eagles medium DMSO: Dimethyl sulfoxide GHK: Glycyl-L-histidyl-L-lysyl GHK-Cu: Copper peptide HaCaT: Human adult low calcium high temperature HDF: Human dermal fibroblasts HPLC: High performance liquid chromatography MN: Microneedle MSS: Microchannel Skin System MTT: 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide PBS: Phosphate buffered saline REFERENCES Pickart L, Thaler MM
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