Having undergone acetylization; having had an acetyl group added to it.
From acetylize + -ed (past tense/adjective suffix). This form appears whenever chemists discuss compounds that have been treated with acetyl reagents.
An acetylized protein is chemically different from its original form, and this difference is so important that your cells have special 'reader' proteins just to recognize which molecules are acetylized, using this information to turn genes on and off.
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