Umbilical VeinsPortal VeinHypertension, PortalVeinsUmbilical ArteriesPortal SystemHuman Umbilical Vein Endothelial CellsEndothelium, VascularSaphenous VeinPortal PressureVaricose VeinsEndothelial CellsCells, CulturedFemoral VeinHernia, UmbilicalMesenteric VeinsPulmonary VeinsJugular VeinsHepatic VeinsFetal BloodSplenic VeinRenal VeinsLiver CirculationUmbilicusIliac VeinPregnancyUltrasonography, PrenatalPopliteal VeinCell AdhesionEndotheliumNeovascularization, PhysiologicUltrasonography, DopplerPortasystemic Shunt, SurgicalE-SelectinSubclavian VeinVascular Cell Adhesion Molecule-1Esophageal and Gastric VaricesCord Blood Stem Cell TransplantationVenous ThrombosisCerebral VeinsHepatic ArteryBlood Flow VelocityVascular Endothelial Growth Factor AAzygos VeinLiverIntercellular Adhesion Molecule-1Vena Cava, InferiorCell MovementRNA, MessengerTime FactorsPortographyNitric Oxide Synthase Type IIIRetinal VeinFetal DiseasesLiver CirrhosisInfant, NewbornUmbilical CordUltrasonography, Doppler, ColorBrachiocephalic VeinsFetal Growth RetardationFetusAngiogenesis InhibitorsGestational AgeTumor Necrosis Factor-alphaNeovascularization, PathologicVenous PressureDose-Response Relationship, DrugPortacaval Shunt, SurgicalAxillary VeinPlacental CirculationThrombinCell Adhesion MoleculesRetinal Vein OcclusionNitric OxideEpoprostenolLigationSignal TransductionCell ProliferationRegional Blood FlowSplenorenal Shunt, SurgicalPulsatile FlowPlacentaPhlebographySplanchnic CirculationCulture Media, ConditionedSingle Umbilical ArteryStress, MechanicalUltrasonography, Doppler, PulsedMuscle, Smooth, VascularInterleukin-1Vascular Endothelial Growth Factor Receptor-2Gastrointestinal HemorrhageCell LineCell Divisionvon Willebrand FactorGene Expression RegulationMaternal-Fetal ExchangeHistamineUp-RegulationAorta