N-methyl-D-aspartate (NMDA) receptors are a class of ionotropic glutamate receptors. NMDA channel has been shown to be involved in long-term potentiation, an activity-dependent increase in the efficiency of synaptic transmission thought to underlie certain kinds of memory and learning. NMDA receptor channels are heteromers composed of the key receptor subunit NMDAR1 (GRIN1) and 1 or more of the 4 NMDAR2 subunits: NMDAR2A (GRIN2A), NMDAR2B (GRIN2B), NMDAR2C (GRIN2C), and NMDAR2D (GRIN2D). [provided by RefSeq, Mar 2010].
Clarke, Johnson: "NMDA receptor NR2 subunit dependence of the slow component of magnesium unblock." in: The Journal of neuroscience : the official journal of the Society for Neuroscience, Vol. 26, Issue 21, pp. 5825-34, (2006) (PubMed).