AllantoisYolk SacExtraembryonic MembranesChorionPrimitive StreakMesodermBlood VesselsEmbryo, MammalianGerm CellsEmbryonic and Fetal DevelopmentPlacentaT-Box Domain ProteinsAmnionCoturnixGene Expression Regulation, DevelopmentalIn Situ HybridizationEpitheliumGastrulaEmbryonic DevelopmentPregnancyReceptors, Growth FactorEncyclopedias as TopicReptilesDinosaursRadioactive Waste