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proenzyme
 

Definitions from WordNet

Noun proenzyme has 1 sense
  1. proenzyme, 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
    --1 is a kind of organic compound

Definitions from the Web

Proenzyme

Noun:

A biologically inactive precursor of an enzyme that requires a biochemical change to become an active enzyme.

Example: The proenzyme pepsinogen is converted into the active enzyme pepsin in the stomach.

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