HemangioblastsFetal ProteinsHematopoiesisVascular Endothelial Growth Factor Receptor-2CoturnixHematopoietic Stem CellsCell DifferentiationStem CellsEndothelium, VascularEmbryonic Stem CellsCell LineageNeovascularization, PhysiologicBlood VesselsMesodermSomitesAllantoisQuailZebrafishZebrafish ProteinsEmbryo, NonmammalianChick EmbryoEndodermReceptors, Growth FactorChimeraReceptors, Vascular Endothelial Growth FactorGene Expression Regulation, DevelopmentalCell MovementEndothelial Cells