GRIN2B and major depressive disorder: The overexpression of miR-124 observed in patients with MDD also appears to modulate the function of several glutamatergic components, including Gria3 (glutamate receptor, ionotropic, Ampa3), Gria4 (glutamate receptor, ionotropic, Ampa4), Grin2a (Glutamate Receptor, Ionotropic, N-Methyl D-Aspartate 2A), Grin2b (Glutamate Receptor, Ionotropic, N-Methyl D-Aspartate 2B) [81].