|  |  | protein polyubiquitinationubiquitin-protein ligase activitynucleuscytoplasmplasma membraneprotein export from nucleustransforming growth factor beta receptor signaling pathwaymembraneprotein ubiquitinationligase activitycell differentiationnegative regulation of ossificationaxonBMP signaling pathwaynegative regulation of transforming growth factor beta receptor signaling pathwayubiquitin-dependent SMAD protein catabolic processreceptor catabolic processprotein localization to cell surfaceprotein ubiquitination involved in ubiquitin-dependent protein catabolic processneuronal cell bodyproteasome-mediated ubiquitin-dependent protein catabolic processI-SMAD bindingR-SMAD binding
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