Activin ReceptorsActivin Receptors, Type IIActivinsActivin Receptors, Type IInhibinsInhibin-beta SubunitsFollistatinBone and BonesReceptors, Growth FactorMyostatinSmad2 ProteinBone RemodelingBone DensityBone Morphogenetic ProteinsReceptors, Transforming Growth Factor betaTransforming Growth Factor betaBone ResorptionNodal ProteinBone MarrowSmad ProteinsSignal TransductionBone Marrow CellsBone NeoplasmsBone DevelopmentGrowth Differentiation FactorsRNA, MessengerBone DiseasesBone Morphogenetic Protein Receptors, Type IMesodermSmad3 ProteinSmad4 ProteinGrowth SubstancesCell DifferentiationEmbryonic InductionBone RegenerationGene Expression Regulation, DevelopmentalBone Morphogenetic Protein Receptors, Type IIXenopus ProteinsIn Situ HybridizationProtein-Serine-Threonine KinasesMyositis OssificansGene ExpressionGlycoproteinsXenopusBone MatrixTrans-ActivatorsBone Marrow TransplantationGranulosa CellsBone TransplantationMolecular Sequence DataEmbryo, NonmammalianReverse Transcriptase Polymerase Chain ReactionOvaryBone SubstitutesCells, CulturedBone Diseases, MetabolicDNA-Binding ProteinsBone Morphogenetic Protein 2Fractures, BoneMice, Inbred C57BLBody PatterningAmino Acid SequenceCell LineImmunohistochemistryProteoglycansBase SequenceFollicle Stimulating Hormone, beta SubunitOsteogenesisCell DivisionReceptors, Cell SurfaceGoosecoid ProteinBone Morphogenetic Protein 4Temporal BoneDNA PrimersProteins