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Anal Biochem 98(1):154159 Massa CM, Liu Z, Taylor S, Pettit AP, Stakheyeva MN, Korotkova E, Popova V, Atochina-Vasserman EN, Gow AJ (2021) Biological mechanisms of S-nitrosothiol formation and degradation: how is specificity of S-nitrosylation achieved

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As humans age, their natural levels of GHK decline, going from around 200ng/mL in the plasma of a 20-year-old to 80ng/mL in a 60-year-old