in contrast a variety of other amino acid agonists ( including quisqualate , kainate , n-methyl d-aspartate ) or antagonists ( including gamma-d-glutamyl glycine acid and 2-amino-5-phosphonovalerate ) are inactive , indicating that the metabolic response is not mediated by any of the receptor subclasses identified electrophysiologically .
C0002520
amino
C0017890
glycine