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The peptide binds to IGF-1 receptors on muscle satellite cells with significantly higher affinity than endogenous IGF-1 due to reduced binding to IGF-binding proteins (IGFBPs), which normally sequester native IGF-1 in the bloodstream

While the largest percentage of intracellular iron is tightly bound to or incorporated into proteins as a cofactor or for storage, small portion of intracellular iron resides in the cytosol and intracellular organelles (e.g., lysosomes) and constitutes a redox-active liable iron pool, which regulates programmed cell death including ferroptosis 42

These changes were found not only in untreated individuals but also in those who were being treated with the medication quetiapine

Journal of Nutrition and Metabolism