GonadsSex DifferentiationSex Determination ProcessesTestisChick EmbryoGenes, sryOctopodiformesSex-Determining Region Y ProteinOvarySOX9 Transcription FactorSteroidogenic Factor 1Sertoli CellsGene Expression Regulation, DevelopmentalGerm CellsWT1 ProteinsCaenorhabditis elegansIn Situ HybridizationCaenorhabditis elegans ProteinsTranscription FactorsHomeodomain ProteinsDNA-Binding ProteinsChickensRNA, MessengerMesonephrosHermaphroditic OrganismsTesticular HormonesWnt4 Protein