IGF-1 LR3 (Long R3 IGF-1) is a high-purity (≥99%) modified insulin-like growth factor-1 with a molecular weight of 9111.0 Da. This 83-amino acid sequence features an Arg3 substitution and 13-amino acid N-terminal extension for enhanced stability. Supplied lyophilized, store at -20°C. Used in growth factor signaling and cellular proliferation research.