Cell CycleCell AgingCell Cycle ProteinsCell Cycle CheckpointsG1 PhaseCyclin-Dependent Kinase Inhibitor p21Tumor Suppressor Protein p53Cell DivisionMitosisCyclinsCell ProliferationCyclin-Dependent Kinase Inhibitor p16ApoptosisS PhaseRetinoblastoma ProteinFibroblastsDNA DamageCell Line, TumorG2 PhaseCells, CulturedCell LineCyclin-Dependent Kinase Inhibitor p27Menstrual CycleSignal TransductionG2 Phase Cell Cycle CheckpointsDNA-Binding ProteinsProtein-Serine-Threonine KinasesTelomereMolecular Sequence DataTumor Suppressor ProteinsPhosphorylationMutationNuclear ProteinsTranscription FactorsGene Expression RegulationAgingRNA, MessengerG0 PhaseCyclin-Dependent Kinase 2CDC2 Protein KinaseFlow CytometryG1 Phase Cell Cycle CheckpointsPlant LeavesTelomeraseDNA ReplicationModels, BiologicalTime FactorsCyclin D1Cyclin ECyclin-Dependent Kinase 4beta-GalactosidaseCell DifferentiationCell NucleusGenes, cdcTranscription, GeneticTumor Cells, CulturedBlotting, WesternDown-RegulationCyclin ABase SequenceCyclin BInterphaseHeLa CellsCell SurvivalRNA, Small InterferingPhenotypeAmino Acid SequenceE2F Transcription FactorsCDC2-CDC28 KinasesRNA InterferenceDNAAging, PrematureEstrous CycleCell Transformation, Neoplasticcdc25 PhosphatasesSaccharomyces cerevisiaePromoter Regions, GeneticGene Expression ProfilingTransfectionReverse Transcriptase Polymerase Chain ReactionGene Expression Regulation, NeoplasticProtein BindingBromodeoxyuridineHistonesUp-RegulationRepressor ProteinsE2F1 Transcription FactorCyclin B1Gene ExpressionAntineoplastic AgentsSaccharomyces cerevisiae ProteinsCyclin-Dependent Kinase 6Cyclin DProtein KinasesGene Expression Regulation, PlantEnzyme InductionNeoplasmsProto-Oncogene ProteinsTumor Suppressor Protein p14ARFEnzyme Inhibitors