Checkpoint Kinase 2Protein-Serine-Threonine KinasesCell Cycle ProteinsCell CycleDNA DamageProtein KinasesG2 PhaseGenes, cdcAtaxia Telangiectasia Mutated ProteinsCell Cycle CheckpointsMitosisS PhaseDNA Repaircdc25 PhosphatasesDNA-Binding ProteinsDNA ReplicationPhosphorylationM Phase Cell Cycle CheckpointsTumor Suppressor ProteinsSpindle ApparatusNuclear ProteinsSaccharomyces cerevisiae ProteinsSchizosaccharomyces pombe ProteinsG2 Phase Cell Cycle CheckpointsSchizosaccharomycesHydroxyureaG1 PhaseTumor Suppressor Protein p53Saccharomyces cerevisiaeMutationMad2 ProteinsGamma RaysFungal ProteinsCDC2 Protein KinaseRadiation, IonizingKinetochoresUltraviolet RaysRad52 DNA Repair and Recombination ProteinIntracellular Signaling Peptides and ProteinsDNA Breaks, Double-StrandedCell LineCyclin BAtaxia TelangiectasiaNocodazoleGenomic InstabilityCyclin-Dependent Kinase Inhibitor p21HeLa CellsMolecular Sequence DataSignal TransductionDNA, FungalApoptosisCyclinsCell Line, TumorCell DivisionDNA Repair EnzymesChromosomal InstabilityS Phase Cell Cycle CheckpointsRadiation ToleranceProtein BindingCdc20 ProteinsRad51 RecombinaseCyclin B1Methyl MethanesulfonateModels, BiologicalAmino Acid SequenceGenes, FungalHistonesG1 Phase Cell Cycle CheckpointsRecombination, GeneticFibroblastsDNABRCA1 ProteinChromosome SegregationRNA, Small InterferingMetaphaseCell NucleusFlow CytometryProtein Kinase InhibitorsDNA HelicasesRepressor ProteinsGene DeletionCell SurvivalEnzyme ActivationCyclin-Dependent KinasesCyclin-Dependent Kinase 2Retinoblastoma ProteinBase SequenceCell ProliferationTumor Cells, CulturedReplication Protein ACalcium-Binding ProteinsChromosomal Proteins, Non-HistoneCarrier ProteinsExonucleasesRNA InterferenceMeiosisCDC2-CDC28 KinasesHCT116 CellsCells, CulturedBlotting, Western