S Phase Cell Cycle CheckpointsCell CycleS PhaseG1 PhaseG2 Phase Cell Cycle CheckpointsCell Cycle ProteinsG1 Phase Cell Cycle CheckpointsM Phase Cell Cycle CheckpointsG2 PhaseCell Cycle CheckpointsDNA DamageMitosisCheckpoint Kinase 2Protein-Serine-Threonine KinasesCyclinsGenes, cdcCell DivisionCyclin-Dependent Kinase Inhibitor p21Ataxia Telangiectasia Mutated ProteinsPhosphorylationDNA ReplicationTumor Suppressor Protein p53ApoptosisRetinoblastoma ProteinCell Line, TumorDNA-Binding ProteinsCell Proliferationcdc25 PhosphatasesCyclin-Dependent Kinase 2CDC2 Protein KinaseTumor Suppressor ProteinsProtein KinasesCyclin-Dependent KinasesCyclin-Dependent Kinase Inhibitor p27Cyclin B1Nuclear ProteinsFlow CytometryCell LineDNA RepairCyclin D1Cyclin ECyclin BHeLa CellsDisease ProgressionG0 PhaseSignal TransductionInterphaseMutationCyclin-Dependent Kinase 4Cyclin ACells, CulturedCDC2-CDC28 KinasesCell NucleusHydroxyureaGamma RaysFibroblastsSpindle ApparatusBromodeoxyuridineTumor Cells, CulturedDNASaccharomyces cerevisiae ProteinsHistonesMolecular Sequence DataCell SurvivalSaccharomyces cerevisiaeRadiation, IonizingBlotting, WesternRNA, Small InterferingTranscription FactorsSchizosaccharomycesAtaxia TelangiectasiaModels, BiologicalRadiation ToleranceMimosineGenomic InstabilityUltraviolet RaysE2F Transcription FactorsNocodazoleSchizosaccharomyces pombe ProteinsFungal ProteinsTime FactorsAntineoplastic AgentsGene Expression Regulation, NeoplasticAmino Acid SequenceProtein BindingE2F1 Transcription FactorBase SequenceRNA, MessengerAphidicolinGene Expression RegulationTransfectionTranscription, GeneticProliferating Cell Nuclear AntigenCarrier ProteinsRNA InterferenceDown-RegulationDNA Breaks, Double-StrandedAntineoplastic Agents, PhytogenicProto-Oncogene ProteinsEnzyme Inhibitors