Abstract
The regional distribution of the NMDA receptor subunits NR2A, 2B, 2C and 2D was visualized in adult rat brain using the histo-blot technique with newly developed subunit-specific antisera. NR2A immunoreactivity was found in almost all regions of the brain, whereas NR2B staining was restricted to forebrain, and NR2D immunoreactivity to diencephalic, mesencephalic and brain stem structures. NR2C staining was confined to cerebellum, thalamus and olfactory bulb. Thus, NMDA receptors containing the NR2A subunit are likely to represent a receptor subtype predominant throughout the brain, while those containing the NR2B, NR2C or NR2D subunit represent more region-specific receptor subtypes. The regionally overlapping distribution of certain NR2 subunits points to the existence of NMDA receptors containing more than one NR2 subunit variant.
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