Cell CycleApoptosisCell Cycle ProteinsCell Cycle CheckpointsDNA DamageG2 PhaseCheckpoint Kinase 2Genes, cdcMitosisS PhaseProtein-Serine-Threonine KinasesAtaxia Telangiectasia Mutated ProteinsG1 PhasePhenotypeG2 Phase Cell Cycle CheckpointsTumor Suppressor Protein p53DNA RepairProtein KinasesDNA-Binding ProteinsTumor Suppressor ProteinsCyclinsCell DivisionPhosphorylationCyclin-Dependent Kinase Inhibitor p21Nuclear ProteinsCell Line, TumorDNA ReplicationMutationM Phase Cell Cycle Checkpointscdc25 PhosphatasesGamma RaysCDC2 Protein KinaseSignal TransductionCyclin BRadiation, IonizingHydroxyureaCell LineAtaxia TelangiectasiaSpindle ApparatusG1 Phase Cell Cycle CheckpointsCell ProliferationFlow CytometryRadiation ToleranceRetinoblastoma ProteinMolecular Sequence DataCell SurvivalHeLa CellsTumor Cells, CulturedCells, CulturedSaccharomyces cerevisiae ProteinsCyclin B1FibroblastsGenomic InstabilitySaccharomyces cerevisiaeModels, BiologicalSchizosaccharomycesS Phase Cell Cycle CheckpointsCyclin-Dependent Kinase 2Cell NucleusNocodazoleSchizosaccharomyces pombe ProteinsUltraviolet RaysRNA, Small InterferingDNAAmino Acid SequenceBlotting, WesternCyclin-Dependent Kinase Inhibitor p27Cyclin EFungal ProteinsTime FactorsDNA Breaks, Double-StrandedHistonesCaspasesAntineoplastic AgentsGenes, p53Base SequenceEnzyme ActivationTransfectionChromosomal InstabilityProtein BindingIntracellular Signaling Peptides and ProteinsApoptosis Regulatory ProteinsCyclin ACaspase 3RNA, MessengerCDC2-CDC28 KinasesTranscription FactorsCyclin D1Gene Expression RegulationProto-Oncogene ProteinsProto-Oncogene Proteins c-bcl-2Menstrual CycleCarrier ProteinsEnzyme InhibitorsBRCA1 ProteinRNA InterferenceMimosineInterphaseDown-RegulationTranscription, Genetic