AllantoisYolk SacEgg YolkEndodermal Sinus TumorExtraembryonic MembranesChorionEmbryo, MammalianVitelline MembraneEmbryonic and Fetal DevelopmentBlood VesselsMesodermPrimitive StreakMesonephromaPlacentaPregnancyEndolymphatic SacGene Expression Regulation, DevelopmentalAmnionAir SacsGerm CellsEmbryonic DevelopmentGestational AgeEndodermChick EmbryoIn Situ HybridizationAnal SacsGestational SacHematopoiesis, ExtramedullaryGastrulaEpitheliumCoturnixErythroid Precursor CellsT-Box Domain Proteinsalpha-FetoproteinsOrgan Culture TechniquesNeovascularization, PhysiologicReceptors, Growth FactorPinocytosisMorphogenesisMice, Mutant StrainsPovidoneReceptors, Vascular Endothelial Growth FactorCell DifferentiationMice, Inbred C57BLMice, Inbred CBADysgerminomaEgg ProteinsEmbryonic InductionHematopoietic Stem Cells