Checkpoint Kinase 2Cell CycleProtein-Serine-Threonine KinasesCell Cycle ProteinsDNA DamageCell Cycle CheckpointsG2 PhaseAtaxia Telangiectasia Mutated ProteinsProtein KinasesGenes, cdcMitosisS PhaseG2 Phase Cell Cycle CheckpointsDNA RepairG1 PhaseM Phase Cell Cycle CheckpointsPhosphorylationTumor Suppressor Protein p53cdc25 PhosphatasesTumor Suppressor ProteinsDNA-Binding ProteinsDNA ReplicationHydroxyureaCDC2 Protein KinaseNuclear ProteinsSpindle ApparatusRadiation, IonizingGamma RaysMutationSaccharomyces cerevisiae ProteinsAtaxia TelangiectasiaSchizosaccharomycesCyclin BCyclin-Dependent Kinase Inhibitor p21Schizosaccharomyces pombe ProteinsApoptosisCyclinsGenomic InstabilityS Phase Cell Cycle CheckpointsRadiation ToleranceCell DivisionSaccharomyces cerevisiaeSignal TransductionCell Line, TumorNocodazoleHeLa CellsUltraviolet RaysDNA Breaks, Double-StrandedCell LineIntracellular Signaling Peptides and ProteinsProtein Kinase InhibitorsKinetochoresModels, BiologicalG1 Phase Cell Cycle CheckpointsCyclin-Dependent KinasesCyclin B1Molecular Sequence DataFibroblastsHistonesFungal ProteinsMethyl MethanesulfonateChromosomal InstabilityPhosphatidylinositol 3-KinasesProtein BindingBRCA1 ProteinRNA, Small InterferingCyclin-Dependent Kinase 2Flow CytometryCell NucleusRetinoblastoma ProteinAmino Acid SequenceCell SurvivalTumor Cells, CulturedDNACell ProliferationCDC2-CDC28 KinasesEnzyme ActivationCaffeineMAP Kinase Signaling SystemCells, CulturedNucleic Acid Synthesis InhibitorsCdc20 ProteinsDNA, FungalGenes, p53RNA InterferenceBlotting, WesternProtein-Tyrosine KinasesHCT116 CellsAphidicolinTransfectionAntineoplastic AgentsPolyploidyDNA Repair EnzymesBase SequenceCarrier ProteinsTime FactorsChromosome SegregationReplication Protein ACyclin E14-3-3 Proteins