the analogs , which were made by site-directed mutagenesis of a synthetic gene encoding for igf i , are [ gln 3 , ala 4 , tyr 15 , leu 16 ] igf i and an analog in which the first 16 amino acids of igf i were replaced with the first 17 amino acids of insulin ( b-chain mutant ) .
C0017797
gln
C0002520
amino