Umbilical VeinsUmbilical CordUmbilical ArteriesFetal BloodHuman Umbilical Vein Endothelial CellsVeinsCord Blood Stem Cell TransplantationHernia, UmbilicalSpinal CordEndothelium, VascularCells, CulturedPregnancyEndothelial CellsSaphenous VeinSpinal Cord InjuriesPortal VeinUmbilicusVaricose VeinsInfant, NewbornUltrasonography, PrenatalUrachal CystBlood BanksFemoral VeinGestational AgeWharton JellyPulmonary VeinsJugular VeinsFetusMesenchymal Stromal CellsPlacentaMaternal-Fetal ExchangeAntigens, CD34Cell AdhesionUltrasonography, DopplerFetal DiseasesNeovascularization, PhysiologicEndotheliumFetal Growth RetardationFetal HypoxiaPlacental CirculationHematopoietic Stem CellsMesenteric VeinsTime FactorsRenal VeinsIliac VeinVascular Cell Adhesion Molecule-1RNA, MessengerCell DifferentiationHepatic VeinsBlood Flow VelocityE-SelectinCell MovementCell Culture TechniquesVascular Endothelial Growth Factor ACell ProliferationHeart Rate, FetalUrachusPopliteal VeinAntigens, CDIntercellular Adhesion Molecule-1Ultrasonography, Doppler, ColorFlow CytometryPregnancy OutcomeCoculture TechniquesSingle Umbilical ArteryStem CellsFetal DistressCesarean SectionCell SeparationApgar ScoreTumor Necrosis Factor-alphaSubclavian VeinDose-Response Relationship, DrugNitric Oxide Synthase Type IIIAmniotic FluidCell Adhesion MoleculesCulture Media, ConditionedSplenic VeinAngiogenesis InhibitorsCell SurvivalSignal TransductionPregnancy Trimester, FirstNuchal CordSpinal Cord DiseasesNeovascularization, PathologicCell DivisionGene Expression RegulationCerebral VeinsHematopoietic Stem Cell TransplantationReverse Transcriptase Polymerase Chain ReactionAsphyxiaPregnancy Trimester, ThirdConstrictionThrombinPre-EclampsiaMeconiumPulsatile FlowPregnancy Trimester, SecondCell LineSpinal Cord Compression