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