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Gragnoli, C

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Researchers observed that upon binding, IGF-1 LR3 induces IGF-1R autophosphorylation, recruiting IRS-1 (insulin receptor substrate-1) and activating two major downstream cascades: the PI3K/Akt pathway (promoting cell survival, protein synthesis via mTOR, and glucose uptake) and the Ras/MAPK/ERK pathway (promoting cell proliferation and differentiation)

The choice of injection site often depends on the type of vitamin used, as some formulations are better absorbed in specific areas