Capable of being acetylated, meaning an acetyl group can be chemically added to the molecule.
From acetylize (to acetylate) + -able (capable of). The -ize verb form came from acetyl in the late 1800s as chemists needed verbs for chemical processes.
Many natural biological molecules are acetylizable—for instance, proteins can have acetyl groups added to their amino acids, and this modification is actually how cells control genes by changing which DNA is readable!
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