Checkpoint Kinase 2Cell CycleCell Cycle ProteinsGenes, cdcDNA DamageProtein-Serine-Threonine KinasesProtein KinasesG2 PhaseCell Cycle CheckpointsMitosisAtaxia Telangiectasia Mutated ProteinsS PhaseM Phase Cell Cycle CheckpointsRadiation, IonizingHydroxyureaDNA RepairSpindle ApparatusG2 Phase Cell Cycle CheckpointsDNA ReplicationDNA-Binding ProteinsNuclear ProteinsSaccharomyces cerevisiae ProteinsPhosphorylationSchizosaccharomycesGamma RaysSchizosaccharomyces pombe Proteinscdc25 PhosphatasesG1 PhaseMutationTumor Suppressor ProteinsTumor Suppressor Protein p53Radiation ToleranceCDC2 Protein KinaseSaccharomyces cerevisiaeUltraviolet RaysFungal ProteinsIntracellular Signaling Peptides and ProteinsS Phase Cell Cycle CheckpointsCyclin BApoptosisCyclin-Dependent Kinase Inhibitor p21Ataxia TelangiectasiaMad2 ProteinsChromosomal InstabilityCell Line, TumorSignal TransductionDose-Response Relationship, RadiationGenomic InstabilityCell DivisionCyclinsNocodazoleMolecular Sequence DataHeLa CellsKinetochoresProtein Kinase InhibitorsGenes, FungalDNA Breaks, Double-StrandedDNA, FungalCell LineRadiation DosageModels, BiologicalPhosphatidylinositol 3-KinasesHistonesCyclin-Dependent KinasesMethyl MethanesulfonateCyclin B1FibroblastsG1 Phase Cell Cycle CheckpointsProtein BindingGene DeletionRNA, Small InterferingBase SequenceCell SurvivalRadiation InjuriesCell NucleusMAP Kinase Signaling SystemAmino Acid SequenceFlow CytometryCyclin-Dependent Kinase 2Enzyme ActivationCdc20 ProteinsDNATumor Cells, CulturedCell ProliferationBRCA1 ProteinRepressor ProteinsCDC2-CDC28 KinasesRetinoblastoma ProteinAneuploidyCDC28 Protein Kinase, S cerevisiaeProtein-Tyrosine KinasesChromosome SegregationBlotting, WesternRNA InterferencePhenotypeRadiation-Sensitizing AgentsCells, CulturedCaffeineTime FactorsNucleic Acid Synthesis Inhibitors