Cell CycleCheckpoint Kinase 2Cell Cycle ProteinsDNA DamageG2 PhaseProtein-Serine-Threonine KinasesCell Cycle CheckpointsGenes, cdcAtaxia Telangiectasia Mutated ProteinsDNA ReplicationMitosisS PhaseDNA-Binding ProteinsG2 Phase Cell Cycle CheckpointsM Phase Cell Cycle CheckpointsProtein KinasesG1 PhaseDNA RepairSpindle ApparatusTumor Suppressor Protein p53Tumor Suppressor ProteinsHydroxyureaNuclear Proteinscdc25 PhosphatasesGamma RaysPhosphorylationRadiation, IonizingAtaxia TelangiectasiaCDC2 Protein KinaseCyclin BS Phase Cell Cycle CheckpointsCyclin-Dependent Kinase Inhibitor p21CyclinsSaccharomyces cerevisiae ProteinsSchizosaccharomycesKinetochoresNocodazoleMutationGenomic InstabilitySchizosaccharomyces pombe ProteinsRadiation ToleranceCell DivisionApoptosisSaccharomyces cerevisiaeG1 Phase Cell Cycle CheckpointsCyclin B1Ultraviolet RaysHeLa CellsDNA Breaks, Double-StrandedSignal TransductionChromosomal InstabilityCell Line, TumorCell LineFungal ProteinsFibroblastsModels, BiologicalRetinoblastoma ProteinHistonesBRCA1 ProteinMethyl MethanesulfonateCdc20 ProteinsMolecular Sequence DataIntracellular Signaling Peptides and ProteinsFlow CytometryCyclin-Dependent Kinase 2Chromosome SegregationMetaphaseCell NucleusGenes, p53DNARNA, Small InterferingDNA Repair EnzymesTumor Cells, CulturedCell ProliferationCell SurvivalProtein BindingAphidicolinCaffeineAnaphaseCyclin-Dependent KinasesCyclin EAmino Acid SequenceNucleic Acid Synthesis InhibitorsDNA, FungalCentrosomePolyploidyCDC2-CDC28 KinasesChromosomal Proteins, Non-HistoneMimosineCells, CulturedCyclin ADose-Response Relationship, RadiationRepressor ProteinsHCT116 CellsUbiquitin-Protein Ligase ComplexesAnaphase-Promoting Complex-CyclosomeCarrier ProteinsChromatinRNA InterferenceExonucleases