RhombencephalonChick EmbryoEmbryo, NonmammalianEmbryo, MammalianGene Expression Regulation, DevelopmentalEarly Growth Response Protein 2MafB Transcription FactorZebrafishBody PatterningIn Situ HybridizationAvian ProteinsZebrafish ProteinsHomeodomain ProteinsMorphogenesisEmbryo ImplantationChickensEmbryonic DevelopmentNeural Crest