Cell CycleS Phase Cell Cycle CheckpointsG2 Phase Cell Cycle CheckpointsMitosisG1 Phase Cell Cycle CheckpointsM Phase Cell Cycle CheckpointsCell Cycle ProteinsG2 PhaseCell Cycle CheckpointsDNA DamageS PhaseCheckpoint Kinase 2G1 PhaseGenes, cdcProtein-Serine-Threonine KinasesAtaxia Telangiectasia Mutated ProteinsTumor Suppressor Protein p53cdc25 PhosphatasesProtein KinasesCDC2 Protein KinaseCyclin-Dependent Kinase Inhibitor p21DNA RepairPhosphorylationCyclinsDNA-Binding ProteinsCell DivisionCyclin B1Spindle ApparatusApoptosisTumor Suppressor ProteinsCell Line, TumorDNA ReplicationNuclear ProteinsCyclin BGamma RaysAtaxia TelangiectasiaHeLa CellsCell ProliferationHydroxyureaRadiation, IonizingRetinoblastoma ProteinCell LineFlow CytometryMutationCyclin-Dependent Kinase 2Radiation ToleranceSignal TransductionG0 PhaseNocodazoleCyclin-Dependent KinasesSchizosaccharomycesSaccharomyces cerevisiae ProteinsGenomic InstabilityCyclin ECyclin-Dependent Kinase Inhibitor p27Cyclin D1Ultraviolet RaysSaccharomyces cerevisiaeInterphaseSchizosaccharomyces pombe ProteinsCell SurvivalKinetochoresFibroblastsTumor Cells, CulturedCell NucleusHistonesRNA, Small InterferingMolecular Sequence DataFungal ProteinsChromosomal InstabilityModels, BiologicalDNA Breaks, Double-StrandedBlotting, WesternCells, CulturedCyclin-Dependent Kinase 4DNACentrosomeAntineoplastic Agents, PhytogenicMetaphaseMimosineAntineoplastic AgentsBRCA1 ProteinCyclin AAphidicolinAmino Acid SequenceChromosome SegregationCDC2-CDC28 KinasesAllyl CompoundsChromosomesGenes, p53Protein BindingMicrotubulesAnaphaseTranscription FactorsIntracellular Signaling Peptides and ProteinsChromatinTime FactorsDose-Response Relationship, RadiationChromosomal Proteins, Non-HistoneGene Expression Regulation, Neoplastic