Checkpoint Kinase 2Cell CycleCell Cycle ProteinsGenes, cdcDNA DamageProtein-Serine-Threonine KinasesProtein KinasesG2 PhaseAtaxia Telangiectasia Mutated ProteinsCell Cycle CheckpointsMitosisAtaxiaS PhaseM Phase Cell Cycle CheckpointsCerebellar AtaxiaHydroxyureaSpindle ApparatusG2 Phase Cell Cycle CheckpointsDNA RepairDNA ReplicationDNA-Binding ProteinsNuclear ProteinsSaccharomyces cerevisiae ProteinsPhosphorylationSchizosaccharomycescdc25 PhosphatasesSchizosaccharomyces pombe ProteinsTumor Suppressor ProteinsAtaxia TelangiectasiaG1 PhaseMutationTumor Suppressor Protein p53CDC2 Protein KinaseGamma RaysSaccharomyces cerevisiaeFriedreich AtaxiaFungal ProteinsRadiation, IonizingIntracellular Signaling Peptides and ProteinsUltraviolet RaysS Phase Cell Cycle CheckpointsCyclin BApoptosisMad2 ProteinsCyclin-Dependent Kinase Inhibitor p21Chromosomal InstabilitySpinocerebellar AtaxiasSignal TransductionGenomic InstabilityCell Line, TumorCell DivisionNocodazoleCyclinsMolecular Sequence DataHeLa CellsKinetochoresProtein Kinase InhibitorsRadiation ToleranceGenes, FungalDNA Breaks, Double-StrandedDNA, FungalCell LineModels, BiologicalPhosphatidylinositol 3-KinasesHistonesCyclin-Dependent KinasesG1 Phase Cell Cycle CheckpointsFibroblastsMethyl MethanesulfonateCyclin B1Protein BindingGene DeletionBase SequenceRNA, Small InterferingGait AtaxiaAmino Acid SequenceCell NucleusMAP Kinase Signaling SystemCyclin-Dependent Kinase 2Cell SurvivalCdc20 ProteinsFlow CytometryEnzyme ActivationBRCA1 ProteinDNARepressor ProteinsCell ProliferationTumor Cells, CulturedPhenotypeCDC2-CDC28 KinasesRetinoblastoma ProteinCDC28 Protein Kinase, S cerevisiaeAneuploidyProtein-Tyrosine KinasesChromosome SegregationRNA InterferenceBlotting, WesternCaffeineNucleic Acid Synthesis InhibitorsCells, Cultured