Extraembryonic MembranesOviparitySerous MembraneViviparity, NonmammalianAllantoisBirdsChorioallantoic MembraneUterusPregnancyEndodermMembranesMembrane LipidsCell MembraneIntracellular MembranesYolk SacMembrane PotentialsMembranes, ArtificialEmbryo, MammalianGastrulaGene Expression Regulation, DevelopmentalTrophoblastsEctodermErythrocyte MembraneEmbryonic and Fetal DevelopmentMembrane FluidityEmbryonic DevelopmentBlastocystPlacentaAmnionChorionCell Membrane PermeabilityChimeraBasement MembraneGerm LayersEmbryo LossMesodermCell LineageGATA6 Transcription FactorEmbryonic Stem CellsModels, BiologicalCell DifferentiationMolecular Sequence DataIn Situ HybridizationDosage Compensation, GeneticMembrane Transport ProteinsBlastodermCell LineGenomic ImprintingSOXF Transcription FactorsPasseriformesMembrane GlycoproteinsChick EmbryoBase SequenceLipid BilayersSongbirdsMutationVisceraAnimal MigrationCells, CulturedEmbryonic InductionGene TargetingGenes, LethalVitelline DuctMorphogenesisMitochondrial MembranesMicroscopy, ElectronBody PatterningEmbryo, NonmammalianGerm CellsHyalinProtein TransportTime FactorsSynaptic MembranesX Chromosome InactivationAmino Acid SequenceBone Morphogenetic Protein 4Signal TransductionX Chromosome