The two analogs of IGF-1, IGF-1 LR3 and des(1-3)IGF-1, are both based on modified versions of insulin-like growth factor-1 (IGF-1), designed to improve its biological activity and effect. The main differences between them are as follows. IGF-1 LR3 (Long Acting version) Structural characteristics: On the basis of natural IGF-1, IGF-1 LR3 replaces the third …