Cell CycleNeuronsCell Cycle ProteinsNeurons, AfferentMotor NeuronsCell Cycle CheckpointsG1 PhaseMitosisS PhaseCells, CulturedCell DivisionCyclinsAction PotentialsApoptosisMenstrual CycleG2 PhaseTime FactorsDopaminergic NeuronsCell ProliferationCyclin-Dependent Kinase Inhibitor p27Cyclin-Dependent Kinase Inhibitor p21Signal TransductionRetinoblastoma ProteinG2 Phase Cell Cycle CheckpointsPhosphorylationImmunohistochemistryMolecular Sequence DataGABAergic NeuronsElectrophysiologyCell LinePatch-Clamp TechniquesCell DifferentiationCell Line, TumorRNA, MessengerNerve Tissue ProteinsHippocampusCDC2 Protein KinaseProtein-Serine-Threonine KinasesG0 PhaseMutationTumor Suppressor Protein p53Cell SurvivalSynapsesDNA-Binding ProteinsG1 Phase Cell Cycle CheckpointsAxonsTranscription FactorsGene Expression RegulationGanglia, SpinalCyclin-Dependent Kinase 2Cyclin D1Synaptic TransmissionCerebral CortexDendritesSensory Receptor CellsElectric StimulationNuclear ProteinsDNA ReplicationCyclin EDNA DamageOlfactory Receptor NeuronsSpinal CordGenes, cdcModels, BiologicalMembrane PotentialsFlow CytometryAnimals, NewbornCyclin AInterphaseCholinergic NeuronsTumor Suppressor Proteinsgamma-Aminobutyric AcidCyclin BCell NucleusCyclin-Dependent Kinase 4BromodeoxyuridineNeural InhibitionNeurons, EfferentMice, Inbred C57BLBlotting, WesternModels, NeurologicalAmino Acid SequenceEstrous CycleMotor Neuron DiseaseMice, TransgenicBase SequenceDose-Response Relationship, DrugCDC2-CDC28 KinasesGene Expression Regulation, DevelopmentalBrainCell CountTranscription, GeneticHeLa CellsGreen Fluorescent ProteinsPyramidal Cellscdc25 PhosphatasesTumor Cells, CulturedRats, WistarMice, KnockoutTransfection