Yolk SacPlacentaEgg YolkEndodermal Sinus TumorPregnancyPlacenta DiseasesPlacenta PreviaPlacenta AccretaPlacenta, RetainedVitelline MembraneMesonephromaTrophoblastsEndolymphatic SacAir SacsMaternal-Fetal ExchangeEmbryo, MammalianPlacentationEndodermExtraembryonic MembranesFetusGestational AgeAnal SacsGestational SacHematopoiesis, ExtramedullaryPregnancy Trimester, FirstEmbryonic and Fetal DevelopmentChorionic Villialpha-FetoproteinsAmnionChorionPregnancy ProteinsPinocytosisGene Expression Regulation, DevelopmentalPovidoneEmbryo LossHematopoietic Stem CellsDysgerminomaEgg ProteinsBlood VesselsPlacental CirculationEmbryonic DevelopmentChoriocarcinomaPregnancy, AnimalHematopoiesisAllantoisHematopoietic SystemMesonephrosImmunohistochemistryFetal DeathPre-EclampsiaTeratomaErythropoiesisUterusCell DifferentiationChick EmbryoMolecular Sequence DataTesticular NeoplasmsUltrasonography, PrenatalNeoplasms, Germ Cell and EmbryonalLiverAmniotic FluidPregnancy Trimester, ThirdErythroblastsBase Sequence