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In hair loss, excessive apoptosis in follicle cells leads to thinner, weaker hair and eventually follicle shutdown

Efficacy and safety of a novel topical formulation containing copper tripeptide-1 (GHK-Cu) for facial photoaging: A randomized, double-blind, placebo-controlled study

Mechanism of activation and inactivation of opsin: role of Glu113 and Lys296

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It is naturally present in human blood, saliva, urine, and its plasma concentration declines with age from approximately 200 ng/mL at age 20 to under 80 ng/mL after age 60

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