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
proenzyme详细解释
pro.en.zyme n.（名词）The inactive or nearly inactive precursor of an enzyme, converted into an active enzyme by proteolysis.Also called zymogen 酶原：酶的非活性或近似非活性的前体，通过蛋白质水解过程转变成活性酶也作 zymogen
