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35 JiaB.SunM.SunX.LiR.WangZ.WuJ.et al (2016)

Insulin-like growth factor long arginine 3 (IGF-1 LR3), is a widely used synthetic analog of IGF-1 with an arginine replacing glutamic acid at position 3 (arginine 3, R3), and an additional 13 amino acids at its N-terminus (long, L)

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(PubMed) Wang B, Yu M, Zhang R, Chen S, Xi Y, Duan G

It is naturally occurring, nontoxic, and readily forms complexes with copper, regulating its metabolism and improving its bioavailability

S2CID 47006345