Cell CycleCell AgingCell Cycle ProteinsCell Cycle CheckpointsCyclin-Dependent Kinase Inhibitor p16Tumor Suppressor Protein p53Cyclin-Dependent Kinase Inhibitor p21FibroblastsG1 PhaseCell ProliferationCell DivisionTelomereDNA DamageRetinoblastoma ProteinAgingApoptosisCyclinsMitosisPlant LeavesTelomeraseCells, CulturedCell Line, TumorS Phasebeta-GalactosidaseSignal TransductionAging, PrematureCell LineCyclin-Dependent Kinase Inhibitor p27G2 PhaseTumor Suppressor ProteinsG2 Phase Cell Cycle CheckpointsDNA-Binding ProteinsProtein-Serine-Threonine KinasesNuclear ProteinsMenstrual CycleMutationGene Expression RegulationPhosphorylationModels, BiologicalTranscription FactorsMolecular Sequence DataDown-RegulationPhenotypeTime FactorsCyclin-Dependent Kinase 4Cyclin-Dependent Kinase 2Cell Transformation, NeoplasticTelomere ShorteningG0 PhaseFlow CytometryG1 Phase Cell Cycle CheckpointsRNA, Small InterferingDNA ReplicationGene Expression Regulation, PlantCyclin D1Cyclin ERNA InterferenceRNA, MessengerTumor Suppressor Protein p14ARFCDC2 Protein KinaseBlotting, WesternCell NucleusGenes, cdcOxidative StressCyclin AChlorophyllCell SurvivalEthylenesCell DifferentiationArabidopsisGene Expression ProfilingCyclin BTranscription, GeneticBase SequenceTumor Cells, CulturedE2F Transcription FactorsReactive Oxygen SpeciesHeLa CellsNeoplasmsHistonesUp-RegulationGene Expression Regulation, NeoplasticReverse Transcriptase Polymerase Chain ReactionLongevityInterphaseCDC2-CDC28 KinasesCyclin-Dependent Kinase 6DNAAmino Acid SequenceEstrous CycleRepressor ProteinsArabidopsis ProteinsTransfectionCell Line, TransformedPromoter Regions, GeneticProto-Oncogene Proteins c-mycPlant ProteinsSaccharomyces cerevisiaeBromodeoxyuridineGene Expression