IGF-1 LR3 peptide is a synthetic protein and lengthened analogue of human insulin-like growth factor 1 (IGF-1). IGF-1 LR3 peptide is originally known as long arginine 3-IGF-1, and abbreviated as or LR3-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).

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