ApoptosisCell CycleCell Cycle ProteinsCheckpoint Kinase 2Cell Cycle CheckpointsDNA DamageG2 PhaseGenes, cdcAtaxia Telangiectasia Mutated ProteinsProtein-Serine-Threonine KinasesMitosisS PhaseG2 Phase Cell Cycle CheckpointsTumor Suppressor Protein p53G1 PhaseDNA RepairProtein KinasesTumor Suppressor ProteinsDNA-Binding ProteinsGamma RaysM Phase Cell Cycle CheckpointsNuclear ProteinsPhosphorylationAtaxia TelangiectasiaRadiation, IonizingCyclin-Dependent Kinase Inhibitor p21cdc25 PhosphatasesDNA ReplicationCyclinsHydroxyureaCell Line, TumorCell DivisionSpindle ApparatusCDC2 Protein KinaseCyclin BSignal TransductionRadiation ToleranceCell LineMutationGenomic InstabilityG1 Phase Cell Cycle CheckpointsCell SurvivalHeLa CellsFlow CytometryTumor Cells, CulturedCyclin B1Saccharomyces cerevisiae ProteinsSchizosaccharomycesFibroblastsCell ProliferationS Phase Cell Cycle CheckpointsNocodazoleUltraviolet RaysRetinoblastoma ProteinCells, CulturedModels, BiologicalDNA Breaks, Double-StrandedSaccharomyces cerevisiaeSchizosaccharomyces pombe ProteinsCaspasesChromosomal InstabilityMolecular Sequence DataApoptosis Regulatory ProteinsGenes, p53RNA, Small InterferingCaspase 3Cell NucleusBRCA1 ProteinCyclin-Dependent Kinase 2HistonesEnzyme ActivationIntracellular Signaling Peptides and ProteinsDNAAntineoplastic AgentsProto-Oncogene Proteins c-bcl-2Fungal ProteinsBlotting, WesternKinetochoresInhibitor of Apoptosis ProteinsProtein BindingTransfectionCyclin EEnzyme InhibitorsTime FactorsProto-Oncogene ProteinsIn Situ Nick-End LabelingAmino Acid SequenceMimosineCarrier ProteinsCyclin-Dependent KinasesDNA Repair EnzymesCell DeathMethyl MethanesulfonateNucleic Acid Synthesis InhibitorsCDC2-CDC28 KinasesHCT116 CellsRNA InterferencePoly(ADP-ribose) PolymerasesCyclin ACaffeine