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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

    drown (someone) out or drown out (someone)
    to make so much noise that it is impossible to hear someone
    The cheering fans drowned out the team captain.



    1.
    Sometimes my grandmother would ________ all different types of thread so she could include more colors in the clothes she sewed.

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