Glutamate-Ammonia LigaseAmmoniaGlutamatesReceptors, GlutamateGlutamic AcidRNA Ligase (ATP)Glutamate DehydrogenaseReceptors, Metabotropic GlutamateNitrogen FixationUbiquitin-Protein LigasesGlutamate SynthaseDNA LigasesNitrogen IsotopesGlutamineSodium GlutamateNitrogen CompoundsAmino Acid Transport System X-AGNitrogen CycleBlood Urea NitrogenGlutamate Plasma Membrane Transport ProteinsReceptor, Metabotropic Glutamate 5