in the isolated frog or rat spinal cord , low concentrations of mg2+ ( 0.5-1.00 mm ) markedly depress , in a substantially ca2+-independent manner , ventral root depolarizations produced by dorsal root stimulation and by certain amino acids ( e.g . n-methyl-d-aspartate and l-homocysteate ) but do not depress depolarizations produced by other excitatory amino acids ( e.g . kainate and quisqualate ) .
C0002520
amino acids
C0243046
excitatory amino acids