Recombinant expression of IGF 1 and LR3 IGF 1 fused with xylanase in Pichia pastoris Applied Microbiology and Biotechnology Springer Nature Link IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society IGF 1 LR3 in Aesthetic and Anti Aging Medicine: Benefits and Risks Hubmed A Medical Review of IGF 1 LR3 Dosage, Side Effects and Safety Aspects IGF1 LR3 Peptide Anderson Longevity Clinic IGF 1LR3 1MG SSP Research