free glutamic acid , aspartic acid , glutamic acid from glutamine and , in some instances , the glutamic acid from glutathione and the aspartic acid from n-acetyl-aspartic acid were isolated from the brains of sheep and assayed for radioactivity after intravenous injection of [ 2- ( 14 ) c ] glucose , [ 1- ( 14 ) c ] acetate , [ 1- ( 14 ) c ] butyrate or [ 2- ( 14 ) c ] propionate .
C0017797
glutamine
C0061472
glutamic acid