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It can develop for a variety of health and environmental reasons, but it is ultimately due to damage to the melanocytes , the cells that produce melanin and determine skin color
All of the N-modified analogues ( 1.65 , 1.70 , and 1.71 ) showed a retention of activity with the GPx and GR enzymes, indicating that antioxidation activities through this pathway is not hindered by modification at the peptide bonds
The needles create temporary channels through the stratum corneum while the serum flows through the needle bore at the same time, bypassing the skin barrier that would otherwise block large molecules like peptides, growth factors, and high-molecular-weight hyaluronic acid
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