IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society IGF1 LR3 1mg Research Peptide for Cell Growth Studies IGF 1 LR3 1mg True Form Peptides IGF 1 LR3 Research Overview IGF 1 LR3 is a modified insulin like growth factor analog currently being studied for its interaction with IGF 1 receptor pathways. Research has focused on its role in cellular IGF 1 LR3 Research Peptide IGF 1 LR3 is a modified insulin like growth factor commonly explored in cellular signaling and growth factor pathway research. Scientists study its extended activity and interaction with IGF