Muscles are most sensitive to growth signals after training. IGF 1 LR3 drives nutrients into muscle cells, boosts protein synthesis and recovery. Triggers muscle growth pathways, and helps nutrients Beyond the bulk: overview and novel insights into the dynamics of muscle satellite cells during muscle regeneration Inflammation and Regeneration Springer Nature Link Control of satellite cell function in muscle regeneration and its disruption in ageing Nature Reviews Molecular Cell Biology Insulin like growth factor 1 stimulates retinal cell proliferation via activation of multiple signaling pathways ScienceDirect