with longer incubation times , the peptides containing the carboxyl ends of the a and b chains are further degraded to form products from cleavage at the a18-19 , b14-15 , b25-26 , and a small amount of a19-20 , b10-11 , and b24-25 cleavage and the emergence of 2-5-amino acid peptide chains , tyrosine , alanine , histidine , and leucine-tyrosine .
C0002520
amino acid
C0001898
alanine