Cell CycleCell Cycle ProteinsGenes, cdcDNA DamageCheckpoint Kinase 2G2 PhaseMitosisProtein-Serine-Threonine KinasesCell Cycle CheckpointsDNA RepairProtein KinasesM Phase Cell Cycle CheckpointsSpindle ApparatusS PhaseAtaxia Telangiectasia Mutated ProteinsHydroxyureaMad2 ProteinsNuclear ProteinsSaccharomyces cerevisiae ProteinsDNA ReplicationDNA-Binding ProteinsG2 Phase Cell Cycle CheckpointsSchizosaccharomycesSchizosaccharomyces pombe ProteinsFungal ProteinsGamma RaysSaccharomyces cerevisiaeMutationG1 PhaseGenes, FungalUltraviolet RaysChromosomal InstabilityTumor Suppressor Protein p53Tumor Suppressor ProteinsIntracellular Signaling Peptides and ProteinsRadiation, Ionizingcdc25 PhosphatasesDNA, FungalPhosphorylationAtaxia TelangiectasiaCDC2 Protein KinaseAneuploidyCyclin BS Phase Cell Cycle CheckpointsMolecular Sequence DataCyclin-Dependent Kinase Inhibitor p21Genomic InstabilityChromosomes, FungalCyclinsCDC28 Protein Kinase, S cerevisiaeGene DeletionRadiation ToleranceDNA Breaks, Double-StrandedKinetochoresNocodazoleApoptosisCell DivisionBase SequenceRepressor ProteinsDNA Repair EnzymesHeLa CellsG1 Phase Cell Cycle CheckpointsSignal TransductionCalcium-Binding ProteinsCyclin B1Cell LineCell Line, TumorFibroblastsPhenotypeMethyl MethanesulfonateModels, BiologicalNeoplasm ProteinsHistonesDNAAllelesBRCA1 ProteinRetinoblastoma ProteinFlow CytometryCdc20 ProteinsCell NucleusCell SurvivalCyclin-Dependent Kinase 2Gene Expression Regulation, NeoplasticGenes, p53Chromosome SegregationDNA PrimersMetaphaseCell ProliferationProtein BindingRNA, Small InterferingModels, GeneticDose-Response Relationship, RadiationTumor Cells, CulturedCells, CulturedAmino Acid SequenceTime FactorsCaffeineNucleic Acid Synthesis InhibitorsAphidicolinCyclin-Dependent Kinases