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The entire IGF-1 gene codes for 194 amino acids, but the mature form of the protein is 70 amino acids, consisting of amino acids 49-118.Product I1146 is R3 IGF-1, which is also 70 amino acids in length. The Glutamic acid (E) at position 3 has simply been replaced by an Arginine (R). So the sequence of Product I1146 is:GP RTLCGAELVD ALQFVCGDRG FYFNKPTGYG SSSRRAPQTG IVDECCFRSC DLRRLEMYCA PLKPAKSAProduct I1271 is the same as I1146, but with an additional thirteen amino acids "in front of" the normal N-terminus of the R3 IGF-1:MFPAM PLSSLFVNGP RTLCGAELVD ALQFVCGDRG FYFNKPTGYG SSSRRAPQTG IVDECCFRSC DLRRLEMYCA PLKPAKSANote that the first 13 amino acids in the recombinant I1271 (MFPAMPLSSLFVN)are quite different from what would have been the preceding 13 amino acids in the immature IGF-1.
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