Cell CycleReactive Oxygen SpeciesOxygenCell AgingCell Cycle ProteinsOxygen ConsumptionCell Cycle CheckpointsOxidative StressApoptosisHydrogen PeroxideG1 PhaseTumor Suppressor Protein p53Cells, CulturedCyclin-Dependent Kinase Inhibitor p21Cell DivisionCell ProliferationDNA DamageSignal TransductionAntioxidantsCell Line, TumorMitosisCyclinsCyclin-Dependent Kinase Inhibitor p16S PhaseFibroblastsNADPH OxidaseCell LineMitochondriaRetinoblastoma ProteinOxidation-ReductionG2 PhaseFree Radical ScavengersTime FactorsPhosphorylationCell SurvivalModels, BiologicalSuperoxide DismutaseSinglet OxygenCyclin-Dependent Kinase Inhibitor p27AgingMenstrual CycleG2 Phase Cell Cycle CheckpointsMutationProtein-Serine-Threonine KinasesCatalaseGene Expression RegulationAcetylcysteineBlotting, WesternDNA-Binding ProteinsMolecular Sequence DataPlant LeavesOxidantsRNA, MessengerFlow CytometryTumor Suppressor ProteinsTelomereSuperoxidesOxygen Inhalation TherapyTranscription FactorsNuclear ProteinsDown-RegulationG0 PhaseRNA, Small InterferingCell DeathG1 Phase Cell Cycle CheckpointsEnzyme InhibitorsCell NucleusReactive Nitrogen SpeciesTelomeraseCyclin-Dependent Kinase 2Enzyme ActivationCyclin D1CDC2 Protein KinaseDNA ReplicationTumor Cells, CulturedDose-Response Relationship, DrugRNA InterferenceMembrane Potential, MitochondrialGlutathioneCyclin EUp-RegulationCyclin-Dependent Kinase 4Transcription, GeneticHeLa CellsBase SequenceGenes, cdcReverse Transcriptase Polymerase Chain ReactionCell DifferentiationPhenotypebeta-GalactosidaseDNAAmino Acid SequenceCyclin AMice, Inbred C57BLCyclin BMice, KnockoutGene Expression ProfilingTransfectionSaccharomyces cerevisiaeAging, Premature