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 FactorsRNA, MessengerMesodermSmad3 ProteinBone Morphogenetic Protein Receptors, Type ISmad4 ProteinEmbryonic InductionGrowth SubstancesXenopus ProteinsProtein-Serine-Threonine KinasesGene Expression Regulation, DevelopmentalMyositis OssificansIn Situ HybridizationXenopusBone Morphogenetic Protein Receptors, Type IIGlycoproteinsGene ExpressionTrans-ActivatorsGranulosa CellsCell DifferentiationMolecular Sequence DataEmbryo, NonmammalianOvaryReverse Transcriptase Polymerase Chain ReactionDNA-Binding ProteinsBody PatterningAmino Acid SequenceCell LineFollicle Stimulating Hormone, beta SubunitProteoglycansImmunohistochemistryGoosecoid ProteinCells, CulturedBase SequenceReceptors, Cell Surface