BlastodermEgg YolkEmbryo, NonmammalianOvumDrosophilaGastrulaBlastodiscDrosophila ProteinsDrosophila melanogasterBody PatterningChick EmbryoTriboliumEgg ProteinsGenes, InsectGene Expression Regulation, DevelopmentalEgg ShellEgg WhiteCoturnixHeteropteraVitelline MembraneInsect ProteinsMorphogenesisQuailFushi Tarazu Transcription FactorsOrganizers, EmbryonicBlastulaZebrafishCleavage Stage, OvumZygoteNodal Signaling LigandsParasite Egg CountInsect HormonesGerm CellsHomeodomain ProteinsGerm LayersAminopterinEmbryonic InductionTranscription FactorsIn Situ Hybridization