Cell CycleApoptosisCell Cycle ProteinsCell Cycle CheckpointsDNA DamageG2 PhaseCheckpoint Kinase 2Genes, cdcProtein-Serine-Threonine KinasesMitosisS PhaseAtaxia Telangiectasia Mutated ProteinsG1 PhaseG2 Phase Cell Cycle CheckpointsTumor Suppressor Protein p53Protein KinasesDNA-Binding ProteinsDNA RepairTumor Suppressor ProteinsPhosphorylationCyclinsCell DivisionSignal TransductionNuclear ProteinsCyclin-Dependent Kinase Inhibitor p21Cell Line, TumorDNA ReplicationCell LineM Phase Cell Cycle Checkpointscdc25 PhosphatasesGamma RaysMutationCDC2 Protein KinaseHeLa CellsCyclin BMolecular Sequence DataRadiation, IonizingHydroxyureaAtaxia TelangiectasiaSpindle ApparatusCell ProliferationG1 Phase Cell Cycle CheckpointsFlow CytometryCell SurvivalCells, CulturedRadiation ToleranceRetinoblastoma ProteinModels, BiologicalTumor Cells, CulturedSaccharomyces cerevisiae ProteinsAmino Acid SequenceCyclin B1Protein BindingFibroblastsSaccharomyces cerevisiaeGenomic InstabilitySchizosaccharomycesS Phase Cell Cycle CheckpointsCell NucleusCyclin-Dependent Kinase 2NocodazoleFungal ProteinsRNA, Small InterferingCarrier ProteinsBlotting, WesternEnzyme ActivationSchizosaccharomyces pombe ProteinsUltraviolet RaysIntracellular Signaling Peptides and ProteinsHistonesBacterial ProteinsTime FactorsCyclin-Dependent Kinase Inhibitor p27DNACyclin ECaspasesTransfectionDNA Breaks, Double-StrandedAntineoplastic AgentsBase SequenceGenes, p53Proto-Oncogene ProteinsApoptosis Regulatory ProteinsGene Expression RegulationTranscription FactorsCaspase 3Enzyme InhibitorsChromosomal InstabilityCyclin ACDC2-CDC28 KinasesCyclin D1RNA, MessengerProto-Oncogene Proteins c-bcl-2RNA InterferenceMenstrual CycleCell DeathBRCA1 ProteinProtein Structure, TertiaryDown-RegulationBacterial Secretion Systems