Cell CycleS Phase Cell Cycle CheckpointsG2 Phase Cell Cycle CheckpointsG1 Phase Cell Cycle CheckpointsM Phase Cell Cycle CheckpointsCell Cycle ProteinsG2 PhaseCell Cycle CheckpointsDNA DamageCheckpoint Kinase 2S PhaseG1 PhaseGenes, cdcAtaxia Telangiectasia Mutated ProteinsMitosisProtein-Serine-Threonine KinasesTumor Suppressor Protein p53Protein Kinasescdc25 PhosphatasesDNA RepairCyclin-Dependent Kinase Inhibitor p21DNA-Binding ProteinsPhosphorylationCell DivisionCell Line, TumorApoptosisCDC2 Protein KinaseCyclinsTumor Suppressor ProteinsCyclin B1Nuclear ProteinsDNA ReplicationGamma RaysCell ProliferationAtaxia TelangiectasiaHydroxyureaRadiation, IonizingCyclin BRetinoblastoma ProteinFlow CytometryMutationSpindle ApparatusRadiation ToleranceSignal TransductionCell LineHeLa CellsG0 PhaseCyclin-Dependent Kinase 2Cell SurvivalCyclin D1Genomic InstabilityCyclin-Dependent Kinase Inhibitor p27Cyclin-Dependent KinasesCyclin EUltraviolet RaysTumor Cells, CulturedRNA, Small InterferingSaccharomyces cerevisiae ProteinsBlotting, WesternNocodazoleAntineoplastic AgentsSaccharomyces cerevisiaeFibroblastsSchizosaccharomycesAntineoplastic Agents, PhytogenicModels, BiologicalGene Expression Regulation, NeoplasticMolecular Sequence DataDNA Breaks, Double-StrandedHistonesChromosomal InstabilitySchizosaccharomyces pombe ProteinsBRCA1 ProteinCyclin-Dependent Kinase 4Cells, CulturedCell NucleusDNAGenes, p53Fungal ProteinsMimosineNeoplasmsAllyl CompoundsTranscription FactorsInterphaseCDC2-CDC28 KinasesDose-Response Relationship, RadiationCyclin AKinetochoresProtein BindingIntracellular Signaling Peptides and ProteinsDose-Response Relationship, DrugAphidicolinNeoplasm ProteinsAmino Acid SequenceBreast NeoplasmsColonic NeoplasmsTime FactorsBase SequenceRNA, MessengerRNA Interference