Smad3 ProteinBasic-Leucine Zipper Transcription FactorsSmad4 ProteinSmad7 ProteinSmad1 ProteinSmad5 ProteinSmad ProteinsSmad8 ProteinTransforming Growth Factor betaTrans-ActivatorsSignal TransductionTransforming Growth Factor beta1Bone Morphogenetic ProteinsReceptors, Transforming Growth Factor betaDNA-Binding ProteinsActivinsBone Morphogenetic Protein 2PhosphorylationBone Morphogenetic Protein ReceptorsBone Morphogenetic Protein Receptors, Type IMinkBone Morphogenetic Protein 4Bone Morphogenetic Protein 7Cell LineProtein BindingTranscription, GeneticFibrosisCOS CellsTransforming Growth Factor beta2Xenopus ProteinsPromoter Regions, GeneticCells, CulturedActivin ReceptorsGene Expression RegulationTranscriptional ActivationLuciferasesTransfectionActivin Receptors, Type IICell DifferentiationProtein-Serine-Threonine KinasesBlotting, WesternCell NucleusNodal ProteinReverse Transcriptase Polymerase Chain ReactionGenes, ReporterMice, KnockoutTranscription FactorsMesodermInhibin-beta SubunitsRNA, Messenger