Cell CycleApoptosisCell Cycle ProteinsCheckpoint Kinase 2Cell Cycle CheckpointsDNA DamageG2 PhaseGenes, cdcProtein-Serine-Threonine KinasesMitosisAtaxia Telangiectasia Mutated ProteinsS PhaseG2 Phase Cell Cycle CheckpointsProtein KinasesG1 PhaseM Phase Cell Cycle CheckpointsTumor Suppressor Protein p53DNA RepairDNA-Binding ProteinsTumor Suppressor ProteinsDNA ReplicationPhosphorylationNuclear ProteinsSpindle Apparatuscdc25 PhosphatasesHydroxyureaCyclinsCell DivisionCDC2 Protein KinaseCyclin-Dependent Kinase Inhibitor p21Gamma RaysRadiation, IonizingCell Line, TumorCyclin BSignal TransductionMutationS Phase Cell Cycle CheckpointsAtaxia TelangiectasiaSaccharomyces cerevisiae ProteinsSchizosaccharomycesCell LineHeLa CellsG1 Phase Cell Cycle CheckpointsNocodazoleSchizosaccharomyces pombe ProteinsRadiation ToleranceSaccharomyces cerevisiaeCyclin B1Genomic InstabilityFlow CytometryCell ProliferationKinetochoresCell SurvivalRetinoblastoma ProteinTumor Cells, CulturedModels, BiologicalUltraviolet RaysMolecular Sequence DataFibroblastsDNA Breaks, Double-StrandedCells, CulturedCyclin-Dependent Kinase 2Fungal ProteinsRNA, Small InterferingCell NucleusChromosomal InstabilityHistonesIntracellular Signaling Peptides and ProteinsDNAProtein BindingEnzyme ActivationBlotting, WesternCyclin EAntineoplastic AgentsAmino Acid SequenceGenes, p53Time FactorsCyclin-Dependent Kinase Inhibitor p27BRCA1 ProteinCyclin ACDC2-CDC28 KinasesCaspasesMethyl MethanesulfonateCarrier ProteinsRNA InterferenceCdc20 ProteinsTransfectionEnzyme InhibitorsMetaphaseChromosome SegregationAphidicolinNucleic Acid Synthesis InhibitorsProto-Oncogene ProteinsCyclin D1HCT116 CellsCaspase 3Apoptosis Regulatory ProteinsProto-Oncogene Proteins c-bcl-2Transcription FactorsCyclin-Dependent Kinases