Yolk Sacalpha-FetoproteinsFetusEgg YolkFetal ProteinsEndodermal Sinus TumorVitelline MembraneMesonephromaEndolymphatic SacAir SacsEndodermEmbryo, Mammalianalpha 1-AntitrypsinAnal SacsGestational SacHematopoiesis, ExtramedullaryPregnancyReceptors, Adrenergic, alphaEmbryonic and Fetal DevelopmentHypoxia-Inducible Factor 1, alpha SubunitPlacentaPinocytosisExtraembryonic MembranesPovidoneHematopoietic Stem CellsEgg ProteinsBase SequenceGene Expression Regulation, DevelopmentalDysgerminomaMolecular Sequence DataGestational Agealpha7 Nicotinic Acetylcholine ReceptorCell DifferentiationBlood VesselsAmnionHematopoiesisChick EmbryoPregnancy Trimester, FirstEmbryo LossIntegrin alpha3beta1Integrin alpha4Transcription FactorsLiverIntegrin alpha6Mice, Inbred C57BLTeratomaErythropoiesisIntegrin alpha5beta1MesonephrosEmbryonic DevelopmentMice, KnockoutTesticular NeoplasmsIntegrin alpha4beta1Hematopoietic SystemInterleukin-1alphaNeoplasms, Germ Cell and EmbryonalImmunohistochemistryIntegrin alpha2beta1Receptors, Adrenergic, alpha-1ErythroblastsIntegrin alpha5Integrin alpha1beta1RNA, MessengerReceptors, Adrenergic, alpha-2Time FactorsGene Expression