Ataxia Telangiectasia Mutated ProteinsAtaxia TelangiectasiaCheckpoint Kinase 2Cell Cycle ProteinsTelangiectasisProtein-Serine-Threonine KinasesDNA DamageTumor Suppressor ProteinsTelangiectasia, Hereditary HemorrhagicDNA-Binding ProteinsAtaxiaProtein KinasesCerebellar AtaxiaRetinal TelangiectasisFriedreich AtaxiaSaccharomyces cerevisiae ProteinsDNA RepairG2 PhaseGenes, cdcRadiation, IonizingCell CyclePhosphorylationSpinocerebellar AtaxiasDNA Breaks, Double-StrandedGamma RaysNuclear ProteinsDNA ReplicationS PhaseTumor Suppressor Protein p53MutationMitosisCell Cycle CheckpointsRadiation ToleranceHistonesDNA-Activated Protein KinaseHydroxyureaGait AtaxiaSignal Transductioncdc25 PhosphatasesUltraviolet RaysG2 Phase Cell Cycle CheckpointsIntracellular Signaling Peptides and ProteinsFibroblastsCell LineGenomic InstabilityEpistaxisDose-Response Relationship, RadiationCell Line, TumorPyronesCDC2 Protein KinaseApoptosisActivin Receptors, Type IIArteriovenous MalformationsM Phase Cell Cycle CheckpointsSchizosaccharomycesReplication Protein ANucleic Acid Synthesis InhibitorsSchizosaccharomyces pombe ProteinsPhosphatidylinositol 3-KinasesProtein Kinase InhibitorsHeLa CellsCell SurvivalSaccharomyces cerevisiaeMethyl MethanesulfonateNijmegen Breakage SyndromeG1 PhaseRNA, Small InterferingCells, CulturedDNAMolecular Sequence DataStreptonigrinTelomereEnzyme ActivationModels, BiologicalDNA Repair EnzymesX-RaysProtein BindingCaffeineAphidicolinSerineCREST SyndromeChromosome AberrationsChromosome BreakageCell NucleusRNA InterferenceChromosomal Proteins, Non-HistoneSpindle ApparatusS Phase Cell Cycle CheckpointsPhenotypeBlotting, WesternMicrocephalyChromatinCell Line, TransformedCyclin-Dependent Kinase Inhibitor p21Amino Acid SequenceRecombination, GeneticCell DivisionInfrared RaysHeterozygoteMice, Knockout