Receptor for glutamate. L-glutamate acts as an excitatory neurotransmitter at many synapses in the central nervous system. The postsynaptic actions of Glu are mediated by a variety of receptors that are named according to their selective agonists (By similarity). Expressed in cerebellar Purkinje cells, in crest cells in the medial octavolateral nucleus and in type I neurons of the optic tectum. Belongs to the glutamate-gated ion channel (TC 1.A.10.1) family. GRID2 subfamily.