Peptide Dosing Guide QK041 Recombinant human bovine porcine IGF 1 LR3 protein Gut derived IL 13 contributes to growth via promoting hepatic IGF 1 production Microbiome Springer Nature Link Frontiers Sheep recombinant IGF 1 promotes organ specific growth in fetal sheep Table 1 from Comparison of low normal and high normal IGF 1 target levels during growth hormone replacement therapy: A randomized clinical trial in adult growth hormone deficiency. Semantic Scholar IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society