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The molecule retains the complete 70-amino-acid native IGF-1 sequence with two structural modifications a 13-amino-acid N-terminal extension (the Long designation) and an arginine-for-glutamic-acid substitution at position 3 (the R3 designation) which together reduce binding affinity to circulating IGF binding proteins (IGFBPs) by approximately 600-fold while preserving full agonist activity at the IGF-1 receptor

Merino-Ribas A, Araujo R, Pereira L, Campos J, Barreiros L, Segundo MA

Mller, S

However, in other studies, the association between zinc supply and glucose metabolism and insulin resistance was not confirmed [18, 33]