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proenzyme

n.
1.any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active

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    Idiom of the Day

    jump the track
    to jump off the rails (usually used for a train), to change suddenly from one thing to another
    The train jumped the track near the edge of the town. The whole project jumped the track and we had to stop it.



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