Cell CycleS Phase Cell Cycle CheckpointsG2 Phase Cell Cycle CheckpointsG1 Phase Cell Cycle CheckpointsM Phase Cell Cycle CheckpointsCell Cycle ProteinsCell ProliferationG2 PhaseCell Cycle CheckpointsS PhaseDNA DamageG1 PhaseCheckpoint Kinase 2MitosisProtein-Serine-Threonine KinasesGenes, cdcAtaxia Telangiectasia Mutated ProteinsCell DivisionTumor Suppressor Protein p53ApoptosisCell Line, TumorProtein KinasesCyclin-Dependent Kinase Inhibitor p21Phosphorylationcdc25 PhosphatasesDNA-Binding ProteinsCyclinsDNA RepairSignal TransductionTumor Suppressor ProteinsCDC2 Protein KinaseCyclin B1Nuclear ProteinsDNA ReplicationCell LineCells, CulturedFlow CytometryGamma RaysRetinoblastoma ProteinHydroxyureaCell SurvivalAtaxia TelangiectasiaRadiation, IonizingCyclin D1Cyclin BCyclin-Dependent Kinase Inhibitor p27G0 PhaseMutationCyclin-Dependent Kinase 2Spindle ApparatusHeLa CellsTumor Cells, CulturedRadiation ToleranceBlotting, WesternCyclin-Dependent KinasesRNA, Small InterferingCyclin EFibroblastsGenomic InstabilityUltraviolet RaysMolecular Sequence DataBromodeoxyuridineSaccharomyces cerevisiae ProteinsModels, BiologicalDNAGene Expression Regulation, NeoplasticAntineoplastic AgentsSaccharomyces cerevisiaeNocodazoleCyclin-Dependent Kinase 4SchizosaccharomycesCell NucleusProliferating Cell Nuclear AntigenRNA, MessengerTranscription FactorsHistonesTime FactorsAntineoplastic Agents, PhytogenicDose-Response Relationship, DrugSchizosaccharomyces pombe ProteinsDNA Breaks, Double-StrandedChromosomal InstabilityCell DifferentiationTransfectionRNA InterferenceCyclin AGene Expression RegulationProtein BindingAmino Acid SequenceIntracellular Signaling Peptides and ProteinsFungal ProteinsInterphaseCDC2-CDC28 KinasesMimosineBRCA1 ProteinBase SequenceDown-RegulationGenes, p53Enzyme InhibitorsEnzyme Activation