Extraembryonic MembranesOviparitySerous MembraneViviparity, NonmammalianAllantoisChorioallantoic MembraneUterusPregnancyCell MembraneMembranesMembrane LipidsEndodermMembranes, ArtificialIntracellular MembranesMembrane PotentialsYolk SacEmbryo, MammalianMembrane FluidityErythrocyte MembraneGastrulaGene Expression Regulation, DevelopmentalTrophoblastsEctodermCell Membrane PermeabilityEmbryonic and Fetal DevelopmentBasement MembraneEmbryonic DevelopmentBlastocystPlacentaLipid BilayersAmnionChorionChimeraModels, BiologicalMicroscopy, ElectronGerm LayersEmbryo LossMesodermCell LineageGATA6 Transcription FactorMolecular Sequence DataEmbryonic Stem CellsMembrane Transport ProteinsCell LineCell DifferentiationLiposomesMembrane GlycoproteinsFreeze FracturingProtein TransportIn Situ HybridizationMutationDosage Compensation, GeneticPhosphatidylcholinesCells, CulturedSynaptic MembranesMitochondrial MembranesBlastodermGenomic ImprintingSOXF Transcription FactorsAmino Acid SequenceCell FractionationEndoplasmic ReticulumMorphogenesisChick EmbryoDetergentsBase SequenceGolgi ApparatusProtein BindingVisceraEmbryonic InductionGene TargetingSignal TransductionCalciumGenes, LethalVitelline DuctTime FactorsUnilamellar LiposomesBody PatterningGerm CellsHyalinHydrogen-Ion ConcentrationProtein Structure, TertiaryEmbryo, NonmammalianX Chromosome InactivationCarrier ProteinsBiological Transport, ActiveBone Morphogenetic Protein 4RNA, MessengerTemperatureMicroscopy, FluorescencePermeabilityX ChromosomeFluorescent Antibody Technique