Umbilical VeinsHuman Umbilical Vein Endothelial CellsVeinsEndothelium, VascularUmbilical ArteriesEndothelial CellsCells, CulturedSaphenous VeinPortal VeinVaricose VeinsFetal BloodHernia, UmbilicalFemoral VeinUmbilical CordCell AdhesionPulmonary VeinsJugular VeinsNeovascularization, PhysiologicEndotheliumE-SelectinVascular Cell Adhesion Molecule-1Vascular Endothelial Growth Factor AIntercellular Adhesion Molecule-1Cell MovementUmbilicusPregnancyMesenteric VeinsRNA, MessengerAngiogenesis InhibitorsNitric Oxide Synthase Type IIIRenal VeinsIliac VeinNeovascularization, PathologicTumor Necrosis Factor-alphaThrombinHepatic VeinsCell Adhesion MoleculesUltrasonography, PrenatalCord Blood Stem Cell TransplantationPopliteal VeinDose-Response Relationship, DrugCell ProliferationSignal TransductionTime FactorsNitric OxideCulture Media, ConditionedEpoprostenolVascular Endothelial Growth Factor Receptor-2Subclavian VeinInterleukin-1Stress, Mechanicalvon Willebrand FactorSplenic VeinChorioallantoic MembraneCell LineCell SurvivalCell DivisionGene Expression RegulationCerebral VeinsEndothelial Growth FactorsUp-RegulationPhosphorylationVascular Endothelial Growth FactorsInterleukin-8Infant, NewbornUltrasonography, DopplerCoculture TechniquesThromboplastinLymphokinesHistamineNF-kappa BEnzyme InhibitorsReverse Transcriptase Polymerase Chain ReactionApoptosisAntigens, CDBlotting, WesternMonocytesAortaRetinal VeinAngiogenesis Inducing AgentsEnzyme ActivationBlood Flow VelocityAzygos VeinFetusBrachiocephalic VeinsFetal DiseasesFetal Growth RetardationNeutrophilsGene ExpressionProto-Oncogene Proteins c-aktGestational AgeRecombinant ProteinsCell Culture TechniquesFlow CytometryAxillary VeinAntigens, CD31Receptors, ThrombinTransfectionPlacental CirculationRetinal Vein Occlusion