Cell CycleG2 Phase Cell Cycle CheckpointsS Phase Cell Cycle CheckpointsCell Cycle ProteinsG1 Phase Cell Cycle CheckpointsM Phase Cell Cycle CheckpointsG2 PhaseCell Cycle CheckpointsG1 PhaseS PhaseDNA DamageMitosisCheckpoint Kinase 2Protein-Serine-Threonine KinasesGenes, cdcCyclinsAtaxia Telangiectasia Mutated ProteinsCell DivisionCyclin-Dependent Kinase Inhibitor p21Tumor Suppressor Protein p53cdc25 PhosphatasesPhosphorylationApoptosisCDC2 Protein KinaseCell Line, TumorProtein KinasesCell ProliferationDNA-Binding ProteinsRetinoblastoma ProteinTumor Suppressor ProteinsCyclin-Dependent Kinase Inhibitor p27Cyclin B1Cyclin-Dependent Kinase 2Cyclin-Dependent KinasesNuclear ProteinsDNA RepairDNA ReplicationCyclin D1Disease ProgressionCyclin BCyclin ESignal TransductionG0 PhaseCell LineFlow CytometryMutationHeLa CellsCyclin-Dependent Kinase 4HydroxyureaGamma RaysSpindle ApparatusCyclin ACDC2-CDC28 KinasesTumor Cells, CulturedCell SurvivalMolecular Sequence DataRadiation, IonizingSaccharomyces cerevisiae ProteinsSaccharomyces cerevisiaeCells, CulturedAtaxia TelangiectasiaBlotting, WesternRNA, Small InterferingFibroblastsTranscription FactorsCell NucleusModels, BiologicalSchizosaccharomycesRadiation ToleranceNocodazoleGenomic InstabilityInterphaseUltraviolet RaysMimosineDNAHistonesGene Expression Regulation, NeoplasticAntineoplastic AgentsSchizosaccharomyces pombe ProteinsE2F Transcription FactorsFungal ProteinsTime FactorsAmino Acid SequenceProtein BindingBase SequenceGene Expression RegulationRNA, MessengerTransfectionE2F1 Transcription FactorBromodeoxyuridineTranscription, GeneticAntineoplastic Agents, PhytogenicCarrier ProteinsAphidicolinDNA Breaks, Double-StrandedRNA InterferenceDown-RegulationProto-Oncogene ProteinsProliferating Cell Nuclear AntigenChromosomal Instability