Activin ReceptorsActivin Receptors, Type IIActivinsActivin Receptors, Type IInhibinsInhibin-beta SubunitsFollistatinReceptors, Growth FactorMyostatinSmad2 ProteinReceptors, Transforming Growth Factor betaNodal ProteinTransforming Growth Factor betaBone Morphogenetic ProteinsSmad ProteinsSignal TransductionGrowth Differentiation FactorsBone Morphogenetic Protein Receptors, Type IRNA, MessengerMesodermSmad3 ProteinSmad4 ProteinProtein-Serine-Threonine KinasesMyositis OssificansXenopus ProteinsEmbryonic InductionGrowth SubstancesGene Expression Regulation, DevelopmentalBone Morphogenetic Protein Receptors, Type IIIn Situ HybridizationXenopusTrans-ActivatorsGene ExpressionGlycoproteinsCell DifferentiationGranulosa CellsMolecular Sequence DataEmbryo, NonmammalianReverse Transcriptase Polymerase Chain ReactionOvaryBody PatterningDNA-Binding ProteinsAmino Acid SequenceImmunohistochemistryCell LineReceptor Protein-Tyrosine KinasesBase SequenceCells, CulturedProteoglycansFollicle Stimulating Hormone, beta SubunitReceptors, Cell SurfaceGoosecoid ProteinDNA Primers