Ionotropic glutamate receptor that functions for a cation permeable ligand-gated ion channel, gated by L-glutamate and also the glutamatergic agonist kainic acid. L-glutamate acts as an excitatory neurotransmitter at numerous synapses in the central anxious technique. Binding from the excitatory neurotransmitter L-glutamate induces a conformation a