Cell CycleApoptosisCell Cycle ProteinsTumor Suppressor Protein p53Cell Cycle CheckpointsDNA DamageG2 PhaseCheckpoint Kinase 2Genes, cdcMitosisS PhaseProtein-Serine-Threonine KinasesAtaxia Telangiectasia Mutated ProteinsGenes, p53G1 PhaseMutationG2 Phase Cell Cycle CheckpointsCyclin-Dependent Kinase Inhibitor p21CyclinsNuclear ProteinsDNA-Binding ProteinsTumor Suppressor ProteinsCell Line, TumorPhosphorylationCell DivisionDNA RepairProtein KinasesTumor Cells, CulturedCell LineMolecular Sequence DataProto-Oncogene Proteins c-mdm2DNA ReplicationM Phase Cell Cycle Checkpointscdc25 PhosphatasesGamma RaysCDC2 Protein KinaseSignal TransductionCell SurvivalCyclin BRadiation, IonizingTransfectionHydroxyureaAtaxia TelangiectasiaSpindle ApparatusProtein BindingG1 Phase Cell Cycle CheckpointsBase SequenceDNAProto-Oncogene ProteinsCell ProliferationFlow CytometryRadiation ToleranceRetinoblastoma ProteinAmino Acid SequenceHeLa CellsBlotting, WesternGene Expression Regulation, NeoplasticSaccharomyces cerevisiae ProteinsCyclin B1Cells, CulturedSaccharomyces cerevisiaeGenomic InstabilityFibroblastsModels, BiologicalSchizosaccharomycesS Phase Cell Cycle CheckpointsTranscription, GeneticRNA, MessengerCyclin-Dependent Kinase 2Cell NucleusNocodazoleNeoplasm ProteinsUltraviolet RaysTime FactorsPromoter Regions, GeneticSchizosaccharomyces pombe ProteinsRNA, Small InterferingCyclin-Dependent Kinase Inhibitor p27Cyclin EFungal ProteinsDNA Breaks, Double-StrandedHistonesCaspasesEnzyme ActivationAntineoplastic AgentsRecombinant Fusion ProteinsChromosomal InstabilityApoptosis Regulatory ProteinsCaspase 3Cyclin AIntracellular Signaling Peptides and ProteinsCDC2-CDC28 KinasesCyclin D1Proto-Oncogene Proteins c-bcl-2Menstrual CycleEnzyme InhibitorsCarrier ProteinsGene Expression RegulationTranscription FactorsBRCA1 Protein