sequence analyses of precursors labelled with [ ( 3 ) h ] glutamine and [ ( 3 ) h ] glutamic acid showed incorporation only of glutamine in a position that matches with the position of pyrrolid-2-one-5-carboxylic acid in the mature forms of all three precursors , and incorporation of glutamic acid in other positions .
C0017797
glutamine
C0061472
glutamic acid