AllantoisChorioallantoic MembraneChorionChick EmbryoExtraembryonic MembranesEgg ShellNeovascularization, PhysiologicAngiogenesis InhibitorsNeovascularization, PathologicEndothelium, VascularAngiogenesis Inducing AgentsVascular Endothelial Growth Factor AFibroblast Growth Factor 2Cell MovementEndothelial CellsEndothelial Growth FactorsVascular Endothelial Growth FactorsCell DivisionCells, CulturedUmbilical VeinsLymphokinesAllantoinCattleCell Line, TumorDose-Response Relationship, DrugChickensCell ProliferationMembranesMice, Inbred C57BLCell MembraneMembrane LipidsIntracellular MembranesOviparityMembrane PotentialsQuailMembranes, ArtificialBlood VesselsVariola virusCoturnixHuman Umbilical Vein Endothelial CellsMastocytomaPoxviridaeCapillariesPlacentaMicroscopy, ElectronOrthomyxoviridaePoxviridae InfectionsErythrocyte MembraneMembrane FluidityVascular Endothelial Growth Factor Receptor-2Neoplasms, ExperimentalCell LinePlacentationCell Membrane PermeabilityViviparity, NonmammalianBasement MembraneTransplantation, Heterologous