amino acid analysis revealed , for each protein , high amounts of cysteine ( 12-20 % ) , glycine ( 15-19 % ) , and serine ( 12-14 % ) , and moderately elevated contents of lysine ( 9-13 % ) and alanine ( 4-8 % ) , but no methionine and only traces , if any , of aromatic amino acids .
C0002520
amino acid
C0017890
glycine