Counteracting muscle wasting in aging and neuromuscular diseases: the critical role of IGF 1 Aging Insulin like growth factor 1 stimulates retinal cell proliferation via activation of multiple signaling pathways ScienceDirect IGF 1 LR3 UK Research Grade Peptide Peptides Lab UK Treatment With scAAV9 IGF 1 Does Not Increase Pax7 Satellite Cell Download Scientific Diagram Researchers can't fully explain why IGF LR3 outperforms its natural counterpart in preclinical models. Engineered in the 1990s with an arginine substitution and N terminal extension, this synthetic IGF 1 analog shows reduced IGFBP binding Control of satellite cell function in muscle regeneration and its disruption in ageing Nature Reviews Molecular Cell Biology