IGF-1 LR3, also caled IGF-1 Long R3, is a form of IGF that has been chemically altered with changed amino acids. It consists of 83 amino acids with a substation of Arg(R) for the Glu(E) at position three. Hence, the name R3. The altercations enable it to avoid binding to proteins in the body, which allows it to have a longer half-life.

 

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