RhombencephalonDiencephalonProsencephalonHoloprosencephalyChick EmbryoMesencephalonCentral Nervous SystemNeural CrestTelencephalonGene Expression Regulation, DevelopmentalMetencephalonZebrafishOptic ChiasmZebrafish ProteinsIn Situ HybridizationBody PatterningSubcommissural OrganHomeodomain ProteinsBrainOtx Transcription FactorsThalamusMamillary BodiesHedgehog ProteinsEmbryo, Nonmammalian