Activin ReceptorsActivinsInhibin-beta SubunitsActivin Receptors, Type IIInhibinsFollistatinActivin Receptors, Type ISmad2 ProteinReceptors, Growth FactorNodal ProteinFollicle Stimulating Hormone, beta SubunitGoosecoid ProteinTransforming Growth Factor betaFollistatin-Related ProteinsSmad3 ProteinSmad ProteinsBone Morphogenetic ProteinsMyostatinReceptors, Transforming Growth Factor betaGonadotrophsSignal TransductionXenopus ProteinsGrowth SubstancesMesodermFollicle Stimulating HormoneEmbryonic InductionSmad4 ProteinRNA, MessengerDioxolesBone Morphogenetic Protein 4Cell DifferentiationXenopusGlycoproteinsSmad7 ProteinFetal ProteinsGene Expression Regulation, DevelopmentalCells, CulturedTrans-ActivatorsGranulosa CellsGrowth Differentiation FactorsEndodermEmbryo, NonmammalianReverse Transcriptase Polymerase Chain ReactionGene ExpressionMolecular Sequence DataPituitary GlandDNA-Binding ProteinsGastrulaIn Situ HybridizationSmad1 ProteinTelangiectasia, Hereditary HemorrhagicBone Morphogenetic Protein Receptors, Type IProstatic Secretory ProteinsT-Box Domain ProteinsParacrine CommunicationBone Morphogenetic Protein ReceptorsOvarian FollicleOvaryHomeodomain ProteinsXenopus laevisGerm LayersImmunohistochemistryAutocrine CommunicationSmad6 ProteinProtein-Serine-Threonine KinasesGene Expression RegulationBlastulaBase SequenceCell DivisionGrowth Differentiation Factor 2Luteinizing Hormone, beta SubunitRecombinant ProteinsMorphogenesisEmbryonic Stem CellsBone Morphogenetic Protein 6Sertoli CellsBone Morphogenetic Protein 7Body PatterningTheca CellsLeft-Right Determination FactorsBone Morphogenetic Protein Receptors, Type IICell LineEctodermNodal Signaling LigandsBone Morphogenetic Protein 2Smad5 ProteinAmino Acid SequenceTranscription FactorsTestisTrophoblastsWolffian DuctsCulture Media, ConditionedPregnancyTranscription, GeneticSOXF Transcription FactorsBlotting, WesternCell ProliferationPromoter Regions, GeneticTransforming Growth Factor beta1DNA Primers