BlastodermEmbryo, NonmammalianDrosophilaGastrulaBlastodiscDrosophila ProteinsDrosophila melanogasterBody PatterningChick EmbryoTriboliumGenes, InsectGene Expression Regulation, DevelopmentalCoturnixInsect ProteinsHeteropteraMorphogenesisQuailFushi Tarazu Transcription FactorsOrganizers, EmbryonicBlastulaZebrafishVitelline MembraneNodal Signaling LigandsCleavage Stage, OvumInsect HormonesHomeodomain ProteinsGerm CellsAminopterinGerm LayersEmbryonic InductionTranscription Factors