Igf-1 long r3 is an 83-amino-acid analog of human IGF-I actually containing the complete human IGF-1 sequence but with the replacement of an Arg for the Glu at position 3, as well as a 13 amino acid extension peptide at the N-terminus. This makes Long R3 IGF-I significantly more potent ( 2-3x) than IGF-I in studies because it has a lower affinity to be rendered inactive by IGF binding proteins, and consequently more potential activity in the body.Â
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