S Phase Cell Cycle CheckpointsS PhaseCell CycleG1 PhaseG2 Phase Cell Cycle CheckpointsG1 Phase Cell Cycle CheckpointsM Phase Cell Cycle CheckpointsCell Cycle ProteinsG2 PhaseCell Cycle CheckpointsDNA DamageCheckpoint Kinase 2MitosisProtein-Serine-Threonine KinasesGenes, cdcAtaxia Telangiectasia Mutated ProteinsDNA ReplicationCyclin-Dependent Kinase Inhibitor p21CyclinsTumor Suppressor Protein p53Cell DivisionDNA-Binding ProteinsPhosphorylationProtein Kinasescdc25 PhosphatasesApoptosisTumor Suppressor ProteinsCell Line, TumorDNA RepairCDC2 Protein KinaseRetinoblastoma ProteinCell ProliferationCyclin-Dependent Kinase 2Cyclin B1Flow CytometryNuclear ProteinsHeLa CellsCell LineGamma RaysCyclin BInterphaseAtaxia TelangiectasiaHydroxyureaRadiation, IonizingG0 PhaseCyclin-Dependent KinasesSpindle ApparatusCyclin ESignal TransductionMutationRadiation ToleranceFibroblastsCyclin-Dependent Kinase Inhibitor p27HistonesCyclin D1Cell NucleusDNABromodeoxyuridineSaccharomyces cerevisiae ProteinsGenomic InstabilityUltraviolet RaysSaccharomyces cerevisiaeCells, CulturedSchizosaccharomycesCell SurvivalNocodazoleTumor Cells, CulturedSchizosaccharomyces pombe ProteinsCyclin-Dependent Kinase 4Molecular Sequence DataRNA, Small InterferingModels, BiologicalDNA Breaks, Double-StrandedBlotting, WesternCDC2-CDC28 KinasesFungal ProteinsCyclin AMimosineChromosomal InstabilityAntineoplastic Agents, PhytogenicMenstrual CycleAntineoplastic AgentsAphidicolinBRCA1 ProteinTranscription FactorsTime FactorsGenes, p53Amino Acid SequenceProtein BindingAllyl CompoundsKinetochoresIntracellular Signaling Peptides and ProteinsChromatinMethyl MethanesulfonateGene Expression Regulation, NeoplasticProliferating Cell Nuclear AntigenDose-Response Relationship, RadiationBase SequenceNucleic Acid Synthesis InhibitorsDNA Repair Enzymes