Cell AgingCell CycleCyclin-Dependent Kinase Inhibitor p16Cell Cycle ProteinsTelomereCyclin-Dependent Kinase Inhibitor p21beta-GalactosidaseTumor Suppressor Protein p53Aging, PrematureTelomeraseAgingCell ProliferationFibroblastsCell Cycle CheckpointsDNA DamageCells, CulturedRetinoblastoma ProteinApoptosisBiological ProcessesTelomere ShorteningCell Line, TumorCell DivisionSignal TransductionG1 PhaseOxidative StressReactive Oxygen SpeciesCell LineCyclinsMitosisGene Expression RegulationPlant LeavesDown-RegulationDNA-Binding ProteinsTime FactorsRNA InterferenceRNA, Small InterferingS PhaseEndothelial CellsPhenotypeBlotting, WesternPhosphorylationFlow CytometryUp-RegulationHistonesTOR Serine-Threonine KinasesCyclin-Dependent Kinase Inhibitor p27G2 PhaseCell DifferentiationTumor Suppressor ProteinsG2 Phase Cell Cycle CheckpointsReverse Transcriptase Polymerase Chain ReactionRNA, MessengerGene Expression Regulation, NeoplasticStem CellsProtein-Serine-Threonine KinasesNuclear ProteinsTransfectionMenstrual CycleMutationMice, KnockoutMice, Inbred C57BLModels, BiologicalTranscription Factorsp38 Mitogen-Activated Protein KinasesMolecular Sequence DataCyclin-Dependent Kinase 4Cyclin-Dependent Kinase 2Cell Transformation, NeoplasticG0 PhaseDose-Response Relationship, DrugG1 Phase Cell Cycle CheckpointsDNA ReplicationGene Expression Regulation, PlantCyclin D1Cyclin EEnzyme ActivationImmunohistochemistryTumor Suppressor Protein p14ARFCDC2 Protein KinaseCell NucleusGenes, cdcCyclin AChlorophyllCell SurvivalEndothelium, VascularEthylenesArabidopsisGene Expression ProfilingCyclin BBiological MarkersTranscription, GeneticBase SequenceTumor Cells, CulturedE2F Transcription FactorsHeLa CellsNeoplasmsLongevityInterphaseCDC2-CDC28 KinasesCyclin-Dependent Kinase 6