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10.3389/fnins.2024.1477519 460 WanapaisanP.ChuansangeamM.NopnipaS.MathuranyanonR.NonthabenjawanN.NgamsombatC.et al

This gave him scope to begin investigating a polypeptide hormone secreted by the parathyroid glands

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Animal Model Evidence The systemic evidence base is entirely preclinical: Pulmonary fibrosis (mouse model): Intraperitoneal GHK-Cu at 0.2-20 micrograms/g/day protected against bleomycin-induced lung fibrosis by inhibiting TGF-beta1/Smad signaling and reducing oxidative stress (PMID 31809714)
PMC 8407049
