Cell CycleCell Cycle ProteinsGenes, cdcCheckpoint Kinase 2DNA DamageG2 PhaseCell Cycle CheckpointsMitosisProtein-Serine-Threonine KinasesEukaryotic CellsAtaxia Telangiectasia Mutated ProteinsS PhaseProtein KinasesDNA RepairSpindle ApparatusHydroxyureaG2 Phase Cell Cycle CheckpointsM Phase Cell Cycle CheckpointsDNA-Binding ProteinsSaccharomyces cerevisiae ProteinsG1 PhaseNuclear ProteinsDNA ReplicationSaccharomyces cerevisiaeSchizosaccharomycesGamma RaysTumor Suppressor Protein p53Fungal ProteinsMutationSchizosaccharomyces pombe ProteinsMad2 ProteinsTumor Suppressor ProteinsMolecular Sequence DataPhosphorylationcdc25 PhosphatasesAtaxia TelangiectasiaGenes, FungalRadiation, IonizingChromosomal InstabilityCyclinsUltraviolet RaysCDC2 Protein KinaseCyclin-Dependent Kinase Inhibitor p21Cyclin BCell DivisionBase SequenceIntracellular Signaling Peptides and ProteinsRadiation ToleranceApoptosisGenomic InstabilityHeLa CellsCell LineAmino Acid SequenceDNA, FungalG1 Phase Cell Cycle CheckpointsSignal TransductionModels, BiologicalCyclin B1Gene DeletionCell Line, TumorNocodazoleS Phase Cell Cycle CheckpointsDNA Breaks, Double-StrandedFibroblastsCell NucleusRetinoblastoma ProteinDNAProtein BindingHistonesRepressor ProteinsAneuploidyChromosomes, FungalCDC28 Protein Kinase, S cerevisiaeCyclin-Dependent Kinase 2Flow CytometryBRCA1 ProteinPhenotypeTumor Cells, CulturedKinetochoresGenes, p53Cell ProliferationSequence Homology, Amino AcidNeoplasm ProteinsCyclin-Dependent KinasesCell SurvivalCells, CulturedCyclin EMethyl MethanesulfonateCarrier ProteinsDNA Repair EnzymesRNA, Small InterferingDNA PrimersCDC2-CDC28 KinasesMimosineCalcium-Binding ProteinsProtein Structure, TertiaryChromatinTranscription, GeneticGene Expression Regulation, NeoplasticRNA, Messenger