Isotope LabelingIsotopesCell NucleusNitrogen IsotopesOxygen IsotopesCarbon IsotopesNucleus AccumbensZinc IsotopesSulfur IsotopesThalamic NucleiSolitary NucleusDeuteriumIron IsotopesCochlear NucleusRaphe NucleiCerebellar NucleiSeptal NucleiActive Transport, Cell NucleusArcuate NucleusCaudate NucleusParaventricular Hypothalamic NucleusStrontium IsotopesSuprachiasmatic NucleusRed NucleusTrigeminal NucleiSubthalamic NucleusRadioisotope Dilution TechniqueSupraoptic NucleusCytoplasmNeurons