Checkpoint Kinase 2Protein-Serine-Threonine KinasesCell CycleCell Cycle ProteinsDNA DamageGenes, cdcG2 PhaseCell Cycle CheckpointsProtein KinasesAtaxia Telangiectasia Mutated ProteinsMitosisS PhaseG2 Phase Cell Cycle CheckpointsDNA RepairG1 PhaseHydroxyureaDNA-Binding ProteinsTumor Suppressor Protein p53M Phase Cell Cycle CheckpointsDNA ReplicationSpindle ApparatusTumor Suppressor ProteinsNuclear Proteinscdc25 PhosphatasesPhosphorylationGamma RaysCDC2 Protein KinaseSaccharomyces cerevisiae ProteinsRadiation, IonizingSchizosaccharomycesMutationSchizosaccharomyces pombe ProteinsAtaxia TelangiectasiaCyclin-Dependent Kinase Inhibitor p21Saccharomyces cerevisiaeCyclinsCyclin BApoptosisCell DivisionFungal ProteinsUltraviolet RaysRadiation ToleranceGenomic InstabilityIntracellular Signaling Peptides and ProteinsCell Line, TumorSignal TransductionChromosomal InstabilityS Phase Cell Cycle CheckpointsCell LineHeLa CellsG1 Phase Cell Cycle CheckpointsMolecular Sequence DataDNA Breaks, Double-StrandedNocodazoleCyclin B1FibroblastsModels, BiologicalHistonesRetinoblastoma ProteinGenes, FungalProtein Kinase InhibitorsCyclin-Dependent Kinase 2Cyclin-Dependent KinasesMad2 ProteinsBRCA1 ProteinDNA, FungalFlow CytometryCell ProliferationMethyl MethanesulfonateProtein BindingCell NucleusTumor Cells, CulturedRNA, Small InterferingKinetochoresCell SurvivalBase SequenceCDC2-CDC28 KinasesDNAAmino Acid SequenceGene DeletionPhosphatidylinositol 3-KinasesGenes, p53Cells, CulturedCaffeineEnzyme ActivationCyclin ENucleic Acid Synthesis InhibitorsBlotting, WesternMimosineRepressor ProteinsAphidicolinDNA Repair EnzymesHCT116 CellsPhenotypeRNA InterferenceTransfectionAntineoplastic AgentsPolyploidyCyclin-Dependent Kinase Inhibitor p27Time Factors