“The effects of NMDA alone and those of NMDA + glycine were antagonized by D-2-amino-5-phosphonopentanoate (D-AP5), Mg2+ , (+)-5-methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohept-5,10-imine hydrogen maleate (MK-801) or 7-chloro-kynurenate (7-Cl-KYNA) but not by strychnine.”