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：zymogen,
例句与用法
1.
Some extracellular proenzymes may be activated by secreted lysosomal proteinases . 有些细胞外酶原能被分泌的溶酶体蛋白酶所激活。
2.
Meanwhile , the partial proenzyme from the abomasums would be activated automatically by the latter two methods 同时还发现盐渍风干处理和自然风干处理可使皱胃中一部分酶原自动激活。
3.
The results of the experiment indicated that the essential of germination was a process of releasing multi - enzyme from proenzyme active substances 通过实验可知：糙米发芽实质是酶活体被激活释放多酶的过程。
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