Cell CycleCell AgingCell Cycle ProteinsCell Cycle CheckpointsCyclin-Dependent Kinase Inhibitor p16Tumor Suppressor Protein p53Cyclin-Dependent Kinase Inhibitor p21FibroblastsG1 PhaseCell ProliferationCell DivisionTelomereDNA DamageApoptosisRetinoblastoma ProteinAgingCells, CulturedMitosisCyclinsPlant LeavesCell Line, TumorTelomeraseS PhaseSignal Transductionbeta-GalactosidaseCell LineAging, PrematureG2 PhaseCyclin-Dependent Kinase Inhibitor p27Tumor Suppressor ProteinsDNA-Binding ProteinsG2 Phase Cell Cycle CheckpointsProtein-Serine-Threonine KinasesGene Expression RegulationMutationNuclear ProteinsTranscription FactorsMolecular Sequence DataMenstrual CyclePhosphorylationModels, BiologicalRNA, MessengerTime FactorsDown-RegulationPhenotypeFlow CytometryCell Transformation, NeoplasticBlotting, WesternRNA, Small InterferingCyclin-Dependent Kinase 2Cyclin-Dependent Kinase 4Telomere ShorteningGene Expression Regulation, PlantRNA InterferenceG0 PhaseCell DifferentiationDNA ReplicationCell NucleusG1 Phase Cell Cycle CheckpointsCyclin D1Cyclin ECDC2 Protein KinaseTranscription, GeneticTumor Suppressor Protein p14ARFBase SequenceOxidative StressCell SurvivalTumor Cells, CulturedGenes, cdcGene Expression ProfilingUp-RegulationCyclin AReverse Transcriptase Polymerase Chain ReactionChlorophyllArabidopsisEthylenesHeLa CellsReactive Oxygen SpeciesCyclin BRepressor ProteinsAmino Acid SequenceGene Expression Regulation, NeoplasticNeoplasmsPromoter Regions, GeneticE2F Transcription FactorsDNAHistonesTransfectionInterphaseGene ExpressionLongevityCDC2-CDC28 KinasesCyclin-Dependent Kinase 6Cell Line, TransformedProtein BindingEstrous CycleArabidopsis ProteinsSaccharomyces cerevisiaePlant ProteinsProto-Oncogene Proteins c-myc