| n. | 1. | (Physiol. Chem.) A mother substance, or antecedent, of an enzyme or chemical ferment; - applied to such substances as, not being themselves actual ferments, may by internal changes give rise to a ferment. |
| Noun | 1. | zymogen - 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 Synonyms: proenzyme |
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