Acknowledgments Thank you to Jeevan Murthy, BS of West Virginia University School of Medicine for assisting in the processing and formatting of this manuscript
doi: 10.1152/physrev.1983.63.4.1420 17
Mechanism and Side Effects of IGF-1 LR3 Aug 12022 IGF-1 LR3 is a synthetic protein and lengthened analogue of human insulin-like growth factor 1 (IGF-1).It differs from native IGF-1 in that it possesses an arginine instead of a glutamic acid at the third position in its amino acid sequence ("arginine 3"), and also has an additional 13 amino acids at its N-terminus (MFPAMPLLSLFVN) ("long"), for a total of 83 amino acids (relative to the 70 of IGF-1).The consequences of these modifications are that IGF-1 LR3 retains the pharmacological activity of IGF-1 as an agonist of the IGF-1 receptor, has very low affinity for the insulin-like growth factor-binding proteins (IGFBPs), and has improved metabolic stability
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