intracellular signal transduction | cellular process | regulation of cellular process | response to stimulus | protein modification process | macromolecule modification | nitrogen compound metabolic process | protein modification by small protein conjugation | cell communication | protein metabolic process | protein ubiquitination | metabolic process | organic substance metabolic process | protein modification by small protein conjugation or removal | signaling | cellular protein metabolic process | cellular protein modification process | cellular metabolic process | signal transduction | macromolecule metabolic process