Circle of WillisCerebral ArteriesCollateral CirculationDNA, CircularMagnetic Resonance AngiographyManagement Quality CirclesNeuroendoscopyCarotid Artery, InternalCerebrovascular CirculationMoyamoya DiseaseCerebral AngiographyDoppler EffectAngiography, Digital SubtractionIntracranial ArteriosclerosisUltrasonography, Doppler, TranscranialBasilar ArteryHistory, 17th CenturyVertebral ArteryIntracranial AneurysmSphenoid BoneCarotid StenosisCarotid Artery, ExternalArachnoidEchoencephalographyMigraine with AuraOphthalmic ArteryIntracranial Arteriovenous MalformationsCarotid-Cavernous Sinus FistulaSkull BaseCranial Fossa, PosteriorBlood Flow VelocityCerebral InfarctionBrainImaging, Three-DimensionalCerebrovascular DisordersPia MaterDominance, CerebralMolecular Sequence DataBase SequenceBrain IschemiaCadaverSubarachnoid HemorrhageUltrasonography, Doppler, ColorArterial Occlusive DiseasesImage Processing, Computer-AssistedIschemic Attack, TransientCarotid ArteriesCarotid Artery DiseasesNamibiaTomography, X-Ray ComputedDNA ReplicationPlasmidsUltrasonographyPerceptual ClosureEndarterectomy, CarotidDNA, ViralAmino Acid SequenceNucleic Acid Amplification TechniquesNucleic Acid ConformationContrast MediaGene Rearrangement, T-LymphocyteStrokeDNA, Single-StrandedReference ValuesRegional Blood FlowMicroscopy, ElectronSensitivity and SpecificityPrimed In Situ LabelingRecombination, GeneticDNA, SuperhelicalEscherichia coliDNAThymus GlandCloning, MolecularAnesthesia, Closed-CircuitPortion SizeRepetitive Sequences, Nucleic AcidProspective StudiesBacteriophage phi X 174Form PerceptionMutationDNA Restriction EnzymesCiliary ArteriesGestalt TheoryNucleic Acid DenaturationNucleic Acid RenaturationHIV Long Terminal RepeatSize PerceptionVirus ReplicationDNA NucleotidyltransferasesPolymerase Chain ReactionDNA, BacterialHandwritingCell LineTelomereDNA, CatenatedTransposasesVirus IntegrationKluyveromycesDNA-Binding Proteins