Glutamate receptors are synaptic receptors located primarily on the membranes of neuronal cells. Upon ligand stimulation, ionotropic glutamate receptors (iGluRs) form non-selective cation channels, while metabotropic glutamate receptors (mGluRs) indirectly activate ion channels via G protein-mediated signaling. AMPA receptors are iGluRs and are also known as alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors, AMPARs, or quisqualate receptors. AMPARs are composed of four types of subunits, GluR1/GluA1 (UniProt P42261) is encoded by GRIA1, GluR2/GluA2 (UniProt P42262) by GRIA2, GluR3/GluA3 (UniProt P42263) by GRIA3, and GluR4/GluA4 (UniProt P48058) by GRIA4 gene in human. AMPARs are tetrameric in nature, consisting of two sets of homodimers, most often a set of GluR2 dimer is coupled with a set of GluR1, GluR3 or GluR4 homodimer. Cat. No. Anti-pan-AMPA receptor (GluR1-4), clone 2D8, reacts with all four AMPA receptor subunits.