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 同义词：proenzyme,
A zymogen (or proenzyme) is an inactive enzyme precursor. A zymogen requires a biochemical change (such as a hydrolysis reaction revealing the active site, or changing the configuration to reveal the active site) for it to become an active enzyme.
例句与用法
1.
Research progress on disease zymogen , disease mechanism and examination method of chicken infectious anemia 致病机理及检测方法研究现状
2.
There are very developed rough surfaced endoplasmic reticulums ( rer ) which was lamellar arrange in cytoplasm of acinar cells and there are much zymogen granules in cytoplasm where approach the lumen of acinus under the electron microscope 电镜下，胰腺泡细胞内有非常发达的粗面内质网，排列呈板层状，靠近腺泡腔的胞质中有许多大而圆的酶原颗粒。
3.
A water soluble crude polysaccharide in the cells has been isolated from the zymogen thread of hericium erinaceus pers . after the crude polysaccharide has been deamylumized by the combined methods of enzyme and sevage , the four graded component - hpa , hpb , hpc , hpd - would be abstracted by the method of ethanol grading 从猴头菌( hericiumerinaceuspers )发酵菌丝体中提取出胞内水溶性粗多糖，经酶法和sevage法联合脱蛋白后，用乙醇分级法分离出hpa 、 hpb 、 hpc 、 hpd四种级分。
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