[zahy-muh-juhn, -jen]
noun Biochemistry.
any of various enzyme precursor molecules that may change into an enzyme as a result of catalytic change.
Also called proenzyme.

< German (1875); see zymo-, -gen

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World English Dictionary
zymogen (ˈzaɪməʊˌdʒɛn)
biochem any of a group of compounds that are inactive precursors of enzymes and are activated by a kinase

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Medical Dictionary

zymogen zy·mo·gen (zī'mə-jən)
See proenzyme.

The American Heritage® Stedman's Medical Dictionary
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