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Injectable administration produces full-body distribution

The peptide glycyl--histidyl--lysine is an endogenous antioxidant in living organisms, possibly by diminishing hydroxyl and peroxyl radicals

For controlled skin studies, topical application removes the confounders introduced by injection no injection site reactions, no systemic distribution diluting local concentration, no injection technique variability across research subjects

Nanoscale Research Letters 2013

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Next, we asked whether metabolite-associated signals were consistent with transcriptional changes previously identified in the same ventricular CSF cohort (cohort 1, Figure S1B) 40