the purified t-antigen was resistant to enzymatic degradation with trypsin and pepsin , formed a single precipitin line with standard t-1 antiserum , failed to react with antisera for teichoic acid , group a carbohydrate , and cross-reactive protein antigens , stimulated only a single precipitin system when rabbits were immunized , contained glycine , aspartic acid , glutamic acid , lysine , and serine as the five most predominant amino acids , and consisted of subunit size isomers .
C0017890
glycine
C0002520
amino acids