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The inactive or nearly inactive precursor of an enzyme, converted into an active enzyme by proteolysis. Also called zymogen.
(Biochemistry) the inactive form of an enzyme; zymogen
zy•mo•gen(ˈzaɪ mə dʒən, -ˌdʒɛn)
any of various enzyme precursor molecules that may change into an enzyme as a result of catalytic change. Also called proenzyme.