“… caffeine (5 mg/kg) and the following NMDA receptor ligands: MK-801 (an antagonist binding …), L-701,324 (an antagonist of the glycine site, 1 mg/kg), and d-cycloserine (a high-efficacy partial agonist of the glycine site, 2.… Mg2+ (10 mg/kg), was not considered as significant.”