Monoubiquitination is the process of adding a single ubiquitin molecule to a specific protein, which serves as a signal for various cellular processes. Synonyms for this word include monoubiquitylated, monoubiquitylation, monoubiquitin, and monoubiquitinylated. These terms all refer to the same enzymatic modification that alters the function and stability of proteins in a cell. The ubiquitin system is involved in diverse cellular processes, including protein turnover, DNA repair, and signaling pathways. Therefore, knowing the synonyms for "monoubiquitinated" is crucial for researchers studying the biology of cells and their mechanisms of regulation.