Activin ReceptorsActivin Receptors, Type IIActivinsActivin Receptors, Type IInhibinsInhibin-beta SubunitsFollistatinReceptors, Growth FactorMyostatinSmad2 ProteinSensitivity and SpecificitySubstrate SpecificityReceptors, Transforming Growth Factor betaNodal ProteinTransforming Growth Factor betaBone Morphogenetic ProteinsSignal TransductionSmad ProteinsMolecular Sequence DataGrowth Differentiation FactorsRNA, MessengerMesodermSmad3 ProteinAmino Acid SequenceBone Morphogenetic Protein Receptors, Type ISmad4 ProteinGrowth SubstancesEmbryonic InductionProtein-Serine-Threonine KinasesXenopus ProteinsGene Expression Regulation, DevelopmentalIn Situ HybridizationMyositis OssificansXenopusGlycoproteinsGene ExpressionBone Morphogenetic Protein Receptors, Type IITrans-ActivatorsBase SequenceGranulosa CellsCell DifferentiationDNA-Binding ProteinsAntibody SpecificityEmbryo, NonmammalianOvaryCell LineReverse Transcriptase Polymerase Chain ReactionProtein BindingSequence Homology, Amino AcidCloning, MolecularBody PatterningDNA PrimersCells, CulturedImmunohistochemistryLigandsReceptors, Cell SurfaceFollicle Stimulating Hormone, beta SubunitProteoglycansTransfectionProteinsMutationSpecies SpecificityGoosecoid ProteinMice, Inbred C57BLCell Division