the specific antagonists of the n-methyl-d-aspartate ( nmda ) receptor , 3- [ ( +/- ) -2-carboxypiperazin-4-yl ] propyl-l-phosphonic acid ( cpp ) and the relatively selective competitive quisqualate ( quis ) /kainate ( ka ) receptor antagonist , 6-cyano-7-dinitroquinoxalinedione ( cnqx ) , were ineffective in blocking the excitatory sulphur amino acid-evoked release of either d- [ 3h ] aspartate , [ 3h ] gaba or of endogenous established transmitter amino acids .
C0243046
excitatory
C0002520
amino acids