Activin Receptors, Type IIActivin ReceptorsActivinsActivin Receptors, Type IMyostatinReceptors, Transforming Growth Factor betaReceptors, Interleukin-1 Type IIInhibinsInhibin-beta SubunitsFollistatinBone Morphogenetic Protein Receptors, Type IIReceptors, Growth FactorTransforming Growth Factor betaProtein-Serine-Threonine KinasesSmad2 ProteinSignal TransductionSmad ProteinsBone Morphogenetic ProteinsReceptors, Interleukin-1Receptors, Tumor Necrosis Factor, Type IIRNA, MessengerMolecular Sequence Data