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
zymogen的用法和樣例：
例句
用作名詞 (n.)
The reactor has some zymogen and acetogen, but no methanogen bacteria. 反應器中有一定量的發酵菌和產乙酸菌，但無產甲烷菌。
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