The Zymogen reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Zymogen

A zymogen is an inactive enzyme pre-cursor. A zymogen requires a biochemical change, such as a hydrolysis reaction revealing the active site, for it to become an active enzyme.

Examples of zymogens are the pancreatic trypsinogen which becomes trypsin and chymotrypsinogen which becomes chymotrypsin.

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